This is a simple sample.
HTML documents consist of a tree of elements and text. Each element is denoted in the source by a [1010]start tag, such as "", and an [1011]end tag, such as "". (Certain start tags and end tags can in certain cases be [1012]omitted and are implied by other tags.) Tags have to be nested such that elements are all completely within each other, without overlapping:This is very wrong!
This is correct.
This specification defines a set of elements that can be used in HTML, along with rules about the ways in which the elements can be nested. Elements can have attributes, which control how the elements work. In the example below, there is a [1013]hyperlink, formed using the [1014]a element and its [1015]href attribute: simple [1016]Attributes are placed inside the start tag, and consist of a [1017]name and a [1018]value, separated by an "=" character. The attribute value can remain [1019]unquoted if it doesn't contain [1020]space characters or any of " ' ` = < or >. Otherwise, it has to be quoted using either single or double quotes. The value, along with the "=" character, can be omitted altogether if the value is the empty string. HTML user agents (e.g. Web browsers) then parse this markup, turning it into a DOM (Document Object Model) tree. A DOM tree is an in-memory representation of a document. DOM trees contain several kinds of nodes, in particular a [1021]DocumentType node, [1022]Element nodes, [1023]Text nodes, [1024]Comment nodes, and in some cases [1025]ProcessingInstruction nodes. The [1026]markup snippet at the top of this section would be turned into the following DOM tree: * DOCTYPE: html * [1027]html + [1028]head o #text: CR VsVs o [1029]title # #text: Sample page o #text: CR Vs + #text: CR Vs + [1030]body o #text: CR VsVs o [1031]h1 # #text: Sample page o #text: CR VsVs o [1032]p # #text: This is a # [1033]a href="demo.html" @ #text: simple # #text: sample. o #text: CR VsVs o #comment: this is a comment o #text: CR Vs CR The [1034]root element of this tree is the [1035]html element, which is the element always found at the root of HTML documents. It contains two elements, [1036]head and [1037]body, as well as a [1038]Text node between them. There are many more [1039]Text nodes in the DOM tree than one would initially expect, because the source contains a number of spaces (represented here by "Vs") and line breaks (" CR ") that all end up as [1040]Text nodes in the DOM. However, for historical reasons not all of the spaces and line breaks in the original markup appear in the DOM. In particular, all the whitespace before [1041]head start tag ends up being dropped silently, and all the whitespace after the [1042]body end tag ends up placed at the end of the [1043]body. The [1044]head element contains a [1045]title element, which itself contains a [1046]Text node with the text "Sample page". Similarly, the [1047]body element contains an [1048]h1 element, a [1049]p element, and a comment. __________________________________________________________________ This DOM tree can be manipulated from scripts in the page. Scripts (typically in JavaScript) are small programs that can be embedded using the [1050]script element or using [1051]event handler content attributes. For example, here is a form with a script that sets the value of the form's [1052]output element to say "Hello World": <[1053]form [1054]name="main"> Result: <[1055]output [1056]name="result"> <[1057]script> [1058]document.[1059]forms.main.[1060]elements.result.[1061]value = 'Hello Wor ld'; Each element in the DOM tree is represented by an object, and these objects have APIs so that they can be manipulated. For instance, a link (e.g. the [1062]a element in the tree above) can have its "[1063]href" attribute changed in several ways: var a = [1064]document.[1065]links[0]; // obtain the first link in the document a.[1066]href = 'sample.html'; // change the destination URL of the link a.[1067]protocol = 'https'; // change just the scheme part of the URL a.setAttribute('href', 'http://example.com/'); // change the content attribute d irectly Since DOM trees are used as the way to represent HTML documents when they are processed and presented by implementations (especially interactive implementations like Web browsers), this specification is mostly phrased in terms of DOM trees, instead of the markup described above. __________________________________________________________________ HTML documents represent a media-independent description of interactive content. HTML documents might be rendered to a screen, or through a speech synthesizer, or on a braille display. To influence exactly how such rendering takes place, authors can use a styling language such as CSS. In the following example, the page has been made yellow-on-blue using CSS.This page is just a demo.
For more details on how to use HTML, authors are encouraged to consult tutorials and guides. Some of the examples included in this specification might also be of use, but the novice author is cautioned that this specification, by necessity, defines the language with a level of detail that might be difficult to understand at first. 1.10.1 Writing secure applications with HTML This section is non-normative. When HTML is used to create interactive sites, care needs to be taken to avoid introducing vulnerabilities through which attackers can compromise the integrity of the site itself or of the site's users. A comprehensive study of this matter is beyond the scope of this document, and authors are strongly encouraged to study the matter in more detail. However, this section attempts to provide a quick introduction to some common pitfalls in HTML application development. The security model of the Web is based on the concept of "origins", and correspondingly many of the potential attacks on the Web involve cross-origin actions. [1068][ORIGIN] Not validating user input Cross-site scripting (XSS) SQL injection When accepting untrusted input, e.g. user-generated content such as text comments, values in URL parameters, messages from third-party sites, etc, it is imperative that the data be validated before use, and properly escaped when displayed. Failing to do this can allow a hostile user to perform a variety of attacks, ranging from the potentially benign, such as providing bogus user information like a negative age, to the serious, such as running scripts every time a user looks at a page that includes the information, potentially propagating the attack in the process, to the catastrophic, such as deleting all data in the server. When writing filters to validate user input, it is imperative that filters always be whitelist-based, allowing known-safe constructs and disallowing all other input. Blacklist-based filters that disallow known-bad inputs and allow everything else are not secure, as not everything that is bad is yet known (for example, because it might be invented in the future). For example, suppose a page looked at its URL's query string to determine what to display, and the site then redirected the user to that page to display a message, as in: If the message was just displayed to the user without escaping, a hostile attacker could then craft a URL that contained a script element: http://example.com/message.cgi?say=%3Cscript%3Ealert%28%27Oh%20no%21%27%29%3C/sc ript%3E If the attacker then convinced a victim user to visit this page, a script of the attacker's choosing would run on the page. Such a script could do any number of hostile actions, limited only by what the site offers: if the site is an e-commerce shop, for instance, such a script could cause the user to unknowingly make arbitrarily many unwanted purchases. This is called a cross-site scripting attack. There are many constructs that can be used to try to trick a site into executing code. Here are some that authors are encouraged to consider when writing whitelist filters: + When allowing harmless-seeming elements like [1069]img, it is important to whitelist any provided attributes as well. If one allowed all attributes then an attacker could, for instance, use the [1070]onload attribute to run arbitrary script. + When allowing URLs to be provided (e.g. for links), the scheme of each URL also needs to be explicitly whitelisted, as there are many schemes that can be abused. The most prominent example is "javascript:", but user agents can implement (and indeed, have historically implemented) others. + Allowing a [1071]base element to be inserted means any [1072]script elements in the page with relative links can be hijacked, and similarly that any form submissions can get redirected to a hostile site. Cross-site request forgery (CSRF) If a site allows a user to make form submissions with user-specific side-effects, for example posting messages on a forum under the user's name, making purchases, or applying for a passport, it is important to verify that the request was made by the user intentionally, rather than by another site tricking the user into making the request unknowingly. This problem exists because HTML forms can be submitted to other origins. Sites can prevent such attacks by populating forms with user-specific hidden tokens, or by checking Origin headers on all requests. Clickjacking A page that provides users with an interface to perform actions that the user might not wish to perform needs to be designed so as to avoid the possibility that users can be tricked into activating the interface. One way that a user could be so tricked is if a hostile site places the victim site in a small [1073]iframe and then convinces the user to click, for instance by having the user play a reaction game. Once the user is playing the game, the hostile site can quickly position the iframe under the mouse cursor just as the user is about to click, thus tricking the user into clicking the victim site's interface. To avoid this, sites that do not expect to be used in frames are encouraged to only enable their interface if they detect that they are not in a frame (e.g. by comparing the [1074]window object to the value of the [1075]top attribute). 1.10.2 Common pitfalls to avoid when using the scripting APIs This section is non-normative. Scripts in HTML have "run-to-completion" semantics, meaning that the browser will generally run the script uninterrupted before doing anything else, such as firing further events or continuing to parse the document. On the other hand, parsing of HTML files happens asynchronously and incrementally, meaning that the parser can pause at any point to let scripts run. This is generally a good thing, but it does mean that authors need to be careful to avoid hooking event handlers after the events could have possibly fired. There are two techniques for doing this reliably: use [1076]event handler content attributes, or create the element and add the event handlers in the same script. The latter is safe because, as mentioned earlier, scripts are run to completion before further events can fire. One way this could manifest itself is with [1077]img elements and the load event. The event could fire as soon as the element has been parsed, especially if the image has already been cached (which is common). Here, the author uses the [1078]onload handler on an [1079]img element to catch the load event:
If the element is being added by script, then so long as the event
handlers are added in the same script, the event will still not be
missed:
However, if the author first created the [1080]img element and then in
a separate script added the event listeners, there's a chance that the
load event would be fired in between, leading it to be missed:
1.11 Conformance requirements for authors
This section is non-normative.
Unlike previous versions of the HTML specification, this specification
defines in some detail the required processing for invalid documents as
well as valid documents.
However, even though the processing of invalid content is in most cases
well-defined, conformance requirements for documents are still
important: in practice, interoperability (the situation in which all
implementations process particular content in a reliable and identical
or equivalent way) is not the only goal of document conformance
requirements. This section details some of the more common reasons for
still distinguishing between a conforming document and one with errors.
1.11.1 Presentational markup
This section is non-normative.
The majority of presentational features from previous versions of HTML
are no longer allowed. Presentational markup in general has been found
to have a number of problems:
The use of presentational elements leads to poorer accessibility
While it is possible to use presentational markup in a way that
provides users of assistive technologies (ATs) with an
acceptable experience (e.g. using ARIA), doing so is
significantly more difficult than doing so when using
semantically-appropriate markup. Furthermore, even using such
techniques doesn't help make pages accessible for non-AT
non-graphical users, such as users of text-mode browsers.
Using media-independent markup, on the other hand, provides an
easy way for documents to be authored in such a way that they
work for more users (e.g. text browsers).
Higher cost of maintenance
It is significantly easier to maintain a site written in such a
way that the markup is style-independent. For example, changing
the color of a site that uses throughout
requires changes across the entire site, whereas a similar
change to a site based on CSS can be done by changing a single
file.
Larger document sizes
Presentational markup tends to be much more redundant, and thus
results in larger document sizes.
For those reasons, presentational markup has been removed from HTML in
this version. This change should not come as a surprise; HTML4
deprecated presentational markup many years ago and provided a mode
(HTML4 Transitional) to help authors move away from presentational
markup; later, XHTML 1.1 went further and obsoleted those features
altogether.
The only remaining presentational markup features in HTML are the
[1081]style attribute and the [1082]style element. Use of the
[1083]style attribute is somewhat discouraged in production
environments, but it can be useful for rapid prototyping (where its
rules can be directly moved into a separate style sheet later) and for
providing specific styles in unusual cases where a separate style sheet
would be inconvenient. Similarly, the [1084]style element can be useful
in syndication or for page-specific styles, but in general an external
style sheet is likely to be more convenient when the styles apply to
multiple pages.
It is also worth noting that some elements that were previously
presentational have been redefined in this specification to be
media-independent: [1085]b, [1086]i, [1087]hr, [1088]s, [1089]small,
and [1090]u.
1.11.2 Syntax errors
This section is non-normative.
The syntax of HTML is constrained to avoid a wide variety of problems.
Unintuitive error-handling behavior
Certain invalid syntax constructs, when parsed, result in DOM
trees that are highly unintuitive.
For example, the following markup fragment results in a DOM with
an [1091]hr element that is an earlier sibling of the
corresponding [1092]table element:
| Game | Corporations | Map Size |
|---|---|---|
| 1830 | Eight | 19+74 h exes (93 total) |
| 1856 | Eleven | 12+87 hexes (99 total) |
| 1870 | Ten | 4+145 h exes (149 total) |
Today, I went out and bought a bike for my kid.
I put a bike bell on his bike.
Our first date was .
In this second snippet, the value includes a time:We stopped talking at .
A script loaded by the page (and thus privy to the page's internal convention of marking up dates and times using the [6427]time element) could scan through the page and look at all the [6428]time elements therein to create an index of dates and times. For example, this element conveys the string "Tuesday" with the additional semantic that the 12th of November 2011 is the meaning that corresponds to "Tuesday": Today is . In this example, a specific time in the Pacific Standard Time timezone is specified: Your next meeting is at . 4.6.12 The code element [6429]Categories: [6430]Flow content. [6431]Phrasing content. [6432]Palpable content. [6433]Contexts in which this element can be used: Where [6434]phrasing content is expected. [6435]Content model: [6436]Phrasing content. [6437]Content attributes: [6438]Global attributes [6439]DOM interface: Uses [6440]HTMLElement. The [6441]code element [6442]represents a fragment of computer code. This could be an XML element name, a filename, a computer program, or any other string that a computer would recognize. Although there is no formal way to indicate the language of computer code being marked up, authors who wish to mark [6443]code elements with the language used, e.g. so that syntax highlighting scripts can use the right rules, may do so by adding a class prefixed with "language-" to the element. The following example shows how the element can be used in a paragraph to mark up element names and computer code, including punctuation.The code element represents a fragment of computer
code.
When you call the activate() method on the
robotSnowman object, the eyes glow.
The example below uses the begin keyword to indicate
the start of a statement block. It is paired with an end
keyword, which is followed by the . punctuation character
(full stop) to indicate the end of the program.
var i: Integer;
begin
i := 1;
end.If there are n pipes leading to the ice cream factory then I expect at least n flavors of ice cream to be available for purchase!
For mathematics, in particular for anything beyond the simplest of expressions, MathML is more appropriate. However, the [6461]var element can still be used to refer to specific variables that are then mentioned in MathML expressions. In this example, an equation is shown, with a legend that references the variables in the equation. The expression itself is marked up with MathML, but the variables are mentioned in the figure's legend using [6462]var.Then he turned to the blackboard and picked up the chalk. After a few moment' s thought, he wrote E = m c2. The teac her looked pleased.
4.6.14 The samp element [6464]Categories: [6465]Flow content. [6466]Phrasing content. [6467]Palpable content. [6468]Contexts in which this element can be used: Where [6469]phrasing content is expected. [6470]Content model: [6471]Phrasing content. [6472]Content attributes: [6473]Global attributes [6474]DOM interface: Uses [6475]HTMLElement. The [6476]samp element [6477]represents (sample) output from a program or computing system. See the [6478]pre and [6479]kbd elements for more details. This example shows the [6480]samp element being used inline:The computer said Too much cheese in tray two but I didn't know what that meant.
This second example shows a block of sample output. Nested [6481]samp and [6482]kbd elements allow for the styling of specific elements of the sample output using a style sheet.jdoe@mowmow:~$ ssh demo.example.com< /kbd> Last login: Tue Apr 12 09:10:17 2005 from mowmow.example.com on pts/1 Linux demo 2.6.10-grsec+gg3+e+fhs6b+nfs+gr0501+++p3+c4a+gr2b-reslog-v6.189 #1 SM P Tue Feb 1 11:22:36 PST 2005 i686 unknown jdoe@demo:~$ _
To make George eat an apple, press Shift+F3< /p> In this second example, the user is told to pick a particular menu item. The outer [6504]kbd element marks up a block of input, with the inner [6505]kbd elements representing each individual step of the input, and the [6506]samp elements inside them indicating that the steps are input based on something being displayed by the system, in this case menu labels:
To make George eat an apple, select File|Eat Apple...
Such precision isn't necessary; the following is equally fine:To make George eat an apple, select File | Eat Apple...
4.6.16 The sub and sup elements [6507]Categories: [6508]Flow content. [6509]Phrasing content. [6510]Palpable content. [6511]Contexts in which this element can be used: Where [6512]phrasing content is expected. [6513]Content model: [6514]Phrasing content. [6515]Content attributes: [6516]Global attributes [6517]DOM interface: Use [6518]HTMLElement. The [6519]sup element [6520]represents a superscript and the [6521]sub element [6522]represents a subscript. These elements must be used only to mark up typographical conventions with specific meanings, not for typographical presentation for presentation's sake. For example, it would be inappropriate for the [6523]sub and [6524]sup elements to be used in the name of the LaTeX document preparation system. In general, authors should use these elements only if the absence of those elements would change the meaning of the content. In certain languages, superscripts are part of the typographical conventions for some abbreviations.The most beautiful women are Mlle Gwendoline and Mme Denise.
The [6525]sub element can be used inside a [6526]var element, for variables that have subscripts. Here, the [6527]sub element is used to represents the subscript that identifies the variable in a family of variables:The coordinate of the ith point is (xi, yi). For example, the 10th point has coordinate (x10, y10).
Mathematical expressions often use subscripts and superscripts. Authors are encouraged to use MathML for marking up mathematics, but authors may opt to use [6528]sub and [6529]sup if detailed mathematical markup is not desired. [6530][MATHML] E=mc2 f(x, n) = log4xn 4.6.17 The i element [6531]Categories: [6532]Flow content. [6533]Phrasing content. [6534]Palpable content. [6535]Contexts in which this element can be used: Where [6536]phrasing content is expected. [6537]Content model: [6538]Phrasing content. [6539]Content attributes: [6540]Global attributes [6541]DOM interface: Uses [6542]HTMLElement. The [6543]i element [6544]represents a span of text in an alternate voice or mood, or otherwise offset from the normal prose in a manner indicating a different quality of text, such as a taxonomic designation, a technical term, an idiomatic phrase from another language, a thought, or a ship name in Western texts. Terms in languages different from the main text should be annotated with [6545]lang attributes (or, in XML, [6546]lang attributes in the XML namespace). The examples below show uses of the [6547]i element:The Felis silvestris catus is cute.
The term prose content is defined above.
There is a certain je ne sais quoi in the air.
In the following example, a dream sequence is marked up using [6548]i elements.Raymond tried to sleep.
The ship sailed away on Thursday, he dreamt. The ship had many people aboard, including a beautiful princess called Carey. He watched her, day-in, day-out, hoping she would notice him, but she never did.
Finally one night he picked up the courage to speak with her--
Raymond woke with a start as the fire alarm rang out.
Authors can use the [6549]class attribute on the [6550]i element to identify why the element is being used, so that if the style of a particular use (e.g. dream sequences as opposed to taxonomic terms) is to be changed at a later date, the author doesn't have to go through the entire document (or series of related documents) annotating each use. Authors are encouraged to consider whether other elements might be more applicable than the [6551]i element, for instance the [6552]em element for marking up stress emphasis, or the [6553]dfn element to mark up the defining instance of a term. Style sheets can be used to format [6554]i elements, just like any other element can be restyled. Thus, it is not the case that content in [6555]i elements will necessarily be italicized. 4.6.18 The b element [6556]Categories: [6557]Flow content. [6558]Phrasing content. [6559]Palpable content. [6560]Contexts in which this element can be used: Where [6561]phrasing content is expected. [6562]Content model: [6563]Phrasing content. [6564]Content attributes: [6565]Global attributes [6566]DOM interface: Uses [6567]HTMLElement. The [6568]b element [6569]represents a span of text to which attention is being drawn for utilitarian purposes without conveying any extra importance and with no implication of an alternate voice or mood, such as key words in a document abstract, product names in a review, actionable words in interactive text-driven software, or an article lede. The following example shows a use of the [6570]b element to highlight key words without marking them up as important:The frobonitor and barbinator components are fried.
In the following example, objects in a text adventure are highlighted as being special by use of the [6571]b element.You enter a small room. Your sword glows brighter. A rat scurries past the corner wall.
Another case where the [6572]b element is appropriate is in marking up the lede (or lead) sentence or paragraph. The following example shows how a [6573]BBC article about kittens adopting a rabbit as their own could be marked up:Six abandoned kittens have found an unexpected new mother figure -- a pet rabbit.
Veterinary nurse Melanie Humble took the three-week-old kittens to her Aberdeen home.
[...] As with the [6574]i element, authors can use the [6575]class attribute on the [6576]b element to identify why the element is being used, so that if the style of a particular use is to be changed at a later date, the author doesn't have to go through annotating each use. The [6577]b element should be used as a last resort when no other element is more appropriate. In particular, headings should use the [6578]h1 to [6579]h6 elements, stress emphasis should use the [6580]em element, importance should be denoted with the [6581]strong element, and text marked or highlighted should use the [6582]mark element. The following would be incorrect usage:WARNING! Do not frob the barbinator!
In the previous example, the correct element to use would have been [6583]strong, not [6584]b. Style sheets can be used to format [6585]b elements, just like any other element can be restyled. Thus, it is not the case that content in [6586]b elements will necessarily be boldened. 4.6.19 The u element [6587]Categories: [6588]Flow content. [6589]Phrasing content. [6590]Palpable content. [6591]Contexts in which this element can be used: Where [6592]phrasing content is expected. [6593]Content model: [6594]Phrasing content. [6595]Content attributes: [6596]Global attributes [6597]DOM interface: Uses [6598]HTMLElement. The [6599]u element [6600]represents a span of text with an unarticulated, though explicitly rendered, non-textual annotation, such as labeling the text as being a proper name in Chinese text (a Chinese proper name mark), or labeling the text as being misspelt. In most cases, another element is likely to be more appropriate: for marking stress emphasis, the [6601]em element should be used; for marking key words or phrases either the [6602]b element or the [6603]mark element should be used, depending on the context; for marking book titles, the [6604]cite element should be used; for labeling text with explicit textual annotations, the [6605]ruby element should be used; for labeling ship names in Western texts, the [6606]i element should be used. The default rendering of the [6607]u element in visual presentations clashes with the conventional rendering of hyperlinks (underlining). Authors are encouraged to avoid using the [6608]u element where it could be confused for a hyperlink. 4.6.20 The mark element [6609]Categories: [6610]Flow content. [6611]Phrasing content. [6612]Palpable content. [6613]Contexts in which this element can be used: Where [6614]phrasing content is expected. [6615]Content model: [6616]Phrasing content. [6617]Content attributes: [6618]Global attributes [6619]DOM interface: Uses [6620]HTMLElement. The [6621]mark element [6622]represents a run of text in one document marked or highlighted for reference purposes, due to its relevance in another context. When used in a quotation or other block of text referred to from the prose, it indicates a highlight that was not originally present but which has been added to bring the reader's attention to a part of the text that might not have been considered important by the original author when the block was originally written, but which is now under previously unexpected scrutiny. When used in the main prose of a document, it indicates a part of the document that has been highlighted due to its likely relevance to the user's current activity. This example shows how the [6623]mark element can be used to bring attention to a particular part of a quotation:Consider the following quote:
Look around and you will find, no-one's really
colour blind.
As we can tell from the spelling of the word, the person writing this quote is clearly not American.
(If the goal was to mark the element as misspelt, however, the [6624]u element, possibly with a class, would be more appropriate.) Another example of the [6625]mark element is highlighting parts of a document that are matching some search string. If someone looked at a document, and the server knew that the user was searching for the word "kitten", then the server might return the document with one paragraph modified as follows:I also have some kittens who are visiting me these days. They're really cute. I think they like my garden! Maybe I should adopt a kitten.
In the following snippet, a paragraph of text refers to a specific part of a code fragment.The highlighted part below is where the error lies:
var i: Integer;
begin
i := 1.1;
end.The highlighted part below is where the error lies:
var i: Integer;
begin
i := 1.1;
end.Did you notice the subtle joke in the joke on panel 4?
I didn't want to believe. Of course on some level I realized it was a known-plaintext attack. But I couldn't admit it until I saw for myself.
(Emphasis mine.) I thought that was great. It's so pedantic, yet it explains everything neatly.
A wormhole in normal conditions can be held open for a maximum of just under 39 minutes. Conditions that can increase the time include a powerful energy source coupled to one or both of the gates connecting the wormhole, and a large gravity well (such as a black hole).
Momentum is preserved across the wormhole. Electromagnetic radiation can travel in both directions through a wormhole, but matter cannot.
When a wormhole is created, a vortex normally forms. Warning: The vortex caused by the wormhole opening will annihilate anything in its path. Vortexes can be avoided when using sufficiently advanced dialing technology.
An obstruction in a gate will prevent it from accepting a wormhole connection.
4.6.21 The ruby element [6633]Categories: [6634]Flow content. [6635]Phrasing content. [6636]Palpable content. [6637]Contexts in which this element can be used: Where [6638]phrasing content is expected. [6639]Content model: One or more groups of: [6640]phrasing content followed either by a single [6641]rt element, or an [6642]rp element, an [6643]rt element, and another [6644]rp element. [6645]Content attributes: [6646]Global attributes [6647]DOM interface: Uses [6648]HTMLElement. The [6649]ruby element allows one or more spans of phrasing content to be marked with ruby annotations. Ruby annotations are short runs of text presented alongside base text, primarily used in East Asian typography as a guide for pronunciation or to include other annotations. In Japanese, this form of typography is also known as furigana. A [6650]ruby element [6651]represents the spans of phrasing content it contains, ignoring all the child [6652]rt and [6653]rp elements and their descendants. Those spans of phrasing content have associated annotations created using the [6654]rt element. In this example, each ideograph in the Japanese text 漢字 is annotated with its reading in hiragana. ... 漢字 ... This might be rendered as: The two main ideographs, each with its annotation in hiragana rendered in a smaller font above it. In this example, each ideograph in the traditional Chinese text 漢字 is annotated with its bopomofo reading. 漢字 This might be rendered as: The two main ideographs, each with its bopomofo annotation rendered in a smaller font next to it. In this example, each ideograph in the simplified Chinese text 汉字 is annotated with its pinyin reading. ...汉字... This might be rendered as: The two main ideographs, each with its pinyin annotation rendered in a smaller font above it. 4.6.22 The rt element [6655]Categories: None. [6656]Contexts in which this element can be used: As a child of a [6657]ruby element. [6658]Content model: [6659]Phrasing content. [6660]Content attributes: [6661]Global attributes [6662]DOM interface: Uses [6663]HTMLElement. The [6664]rt element marks the ruby text component of a ruby annotation. An [6665]rt element that is a child of a [6666]ruby element [6667]represents an annotation (given by its children) for the zero or more nodes of phrasing content that immediately precedes it in the [6668]ruby element, ignoring [6669]rp elements. An [6670]rt element that is not a child of a [6671]ruby element represents the same thing as its children. 4.6.23 The rp element [6672]Categories: None. [6673]Contexts in which this element can be used: As a child of a [6674]ruby element, either immediately before or immediately after an [6675]rt element. [6676]Content model: [6677]Phrasing content. [6678]Content attributes: [6679]Global attributes [6680]DOM interface: Uses [6681]HTMLElement. The [6682]rp element can be used to provide parentheses around a ruby text component of a ruby annotation, to be shown by user agents that don't support ruby annotations. An [6683]rp element that is a child of a [6684]ruby element [6685]represents nothing and its contents must be ignored. An [6686]rp element whose parent element is not a [6687]ruby element [6688]represents its children. The example above, in which each ideograph in the text 漢字 is annotated with its phonetic reading, could be expanded to use [6689]rp so that in legacy user agents the readings are in parentheses: ... 漢字< rp>) ... In conforming user agents the rendering would be as above, but in user agents that do not support ruby, the rendering would be: ... 漢 (kan5) 字 (zi) ... 4.6.24 The bdi element [6690]Categories: [6691]Flow content. [6692]Phrasing content. [6693]Palpable content. [6694]Contexts in which this element can be used: Where [6695]phrasing content is expected. [6696]Content model: [6697]Phrasing content. [6698]Content attributes: [6699]Global attributes Also, the [6700]dir global attribute has special semantics on this element. [6701]DOM interface: Uses [6702]HTMLElement. The [6703]bdi element [6704]represents a span of text that is to be isolated from its surroundings for the purposes of bidirectional text formatting. [6705][BIDI] The [6706]dir global attribute defaults to [6707]auto on this element (it never inherits from the parent element like with other elements). For the purposes of applying the bidirectional algorithm to the contents of a [6708]bdi element, user agents must treat the element as a paragraph-level container. For the purposes of applying the bidirectional algorithm to the paragraph-level container that a [6709]bdi element finds itself within, the [6710]bdi element must be treated like a U+FFFC OBJECT REPLACEMENT CHARACTER (in the same manner that an image or other inline object is handled). The requirements on handling the [6711]bdi element for the bidirectional algorithm may be implemented indirectly through the style layer. For example, an HTML+CSS user agent could implement these requirements by implementing the CSS 'unicode-bidi' property. [6712][CSS] This element is especially useful when embedding user-generated content with an unknown directionality. In this example, usernames are shown along with the number of posts that the user has submitted. If the [6713]bdi element were not used, the username of the Arabic user would end up confusing the text (the bidirectional algorithm would put the colon and the number "3" next to the word "User" rather than next to the word "posts").for (
j = 0; j < 256; j++) {
i_t3 = (i_t3 & 0x1ffff)
| (j << 17);
i_t6 = (((((((i_t3 >> 3)
^ i_t3) >> 1) ^ i_t3) >>
8) ^ i_t3) >> 5) & 0xff;
if (i_t6 == i_t1)
break;
}P. Sherman
42 Wallaby Way
Sydney
So then he pointed at the tiger and screamed
"there
... Heading heading = Helm.HeadingFactory(HeadingCoordinates[1],Any content inside [6793]wbr elements must not be considered part of the surrounding text. 4.6.29 Usage summary This section is non-normative. Element Purpose Example [6794]a Hyperlinks Visit my drinks page. [6795]em Stress emphasis I must say I adore lemonade. [6796]strong Importance This tea is very hot. [6797]small Side comments These grapes are made into wine. Alcohol is addictive. [6798]s Inaccurate text Price:HeadingCoordin ates[2], HeadingCoordinates[3], HeadingCoordinates[4]); Course course = Helm.CourseFactory(Heading, Maps.MapFactoryFromHeading(head ing), Speeds.GetMaximumSpeed().ConvertToWarp()); ...
You can drink water from the fish tankbut advised against it. [6801]dfn Defining instance The term organic food refers to food produced without synthetic chemi cals. [6802]abbr Abbreviations Organic food in Ireland is certified by the IOFGA. [6803]data Machine-readable equivalent Available starting today! North Coast Organic App le Cider [6804]time Machine-readable equivalent of date- or time-related data Available starting on ! [6805]code Computer code The
fruitdb program can be used for tracking fruit production.
[6806]var Variables
If there are n fruit in the bowl, at least n÷2 will be rip
e.
[6807]samp Computer output
The computer said Unknown error -3.
[6808]kbd User input
Hit F1 to continue.
[6809]sub Subscripts
Water is H2O.
[6810]sup Superscripts
The Hydrogen in heavy water is usually 2H.
[6811]i Alternative voice
Lemonade consists primarily of Citrus limon.
[6812]b Keywords
Take a lemon and squeeze it with a juicer.
[6813]u Annotations
The mixture of apple juice and eldeflower juice is very
pleasant.
[6814]mark Highlight
Elderflower cordial, with one part cordial to ten part
s water, stands apart from the rest.
[6815]ruby, [6816]rt, [6817]rp Ruby annotations
OJ
[6818]bdi Text directionality isolation
The recommended restaurant is My Juice Café (At The Beach).
[6819]bdo Text directionality formatting
The proposal is to write English, but in reverse order. "Juice" would become "Juice"
[6820]span Other
In French we call it sirop de sureau.
[6821]br Line break
Simply Orange Juice CompanyThis is a paragraph that was inserted.
This is another paragraph whose first sentence was inserted at the same time as the paragraph above. This is a second sentence, which was there all along.This second paragraph was inserted.
This sentence was inserted too. This is the third paragraph in this example.This is the first paragraph. This sentence was
deleted.
This sentence was deleted too. That
sentence needed a separate <del> element.
| Game name | Game publisher | Verdict |
|---|---|---|
| Diablo 2 | Blizzard | 8/10 |
| Portal | Valve | 10/10 |
| Portal 2 | Valve | 10/10 |
| Game name | Game publisher | |
|---|---|---|
| Diablo 2 | Blizzard | |
| Portal | Valve | |
| Portal 2 | Valve | |
I lived in 
Carouge.
Home town:
Carouge has a coat of arms.
It is used as decoration all over the town.
Here it is used as a way to support a similar text where the description is given as well as, instead of as an alternative to, the image:Carouge has a coat of arms.
The coat of arms depicts a lion, sitting in front of a tree. It is used as decoration all over the town.
Here it is used as part of a story:He picked up the folder and a piece of paper fell out.
He stared at the folder. S! The answer he had been looking for all this time was simply the letter S! How had he not seen that before? It all came together now. The phone call where Hector had referred to a lion's tail, the time Marco had stuck his tongue out...
Here it is not known at the time of publication what the image will be, only that it will be a coat of arms of some kind, and thus no replacement text can be provided, and instead only a brief caption for the image is provided, in the [7292]title attribute:The last user to have uploaded a coat of arms uploaded this one:
Fluffy is my favorite.
She's just too cute.
My other cat, Miles just eats and sleeps.
The trick here is to know how to anticipate; to know at what speed and what distance the subject will pass by.
To achieve this, you'll need either an extremely sensitive film, or immense flash lights.
I've got a cat named Fluffy and a dog named Miles.
My dog Miles and I like go on long walks together.
After our walks, having emptied my mind, I like listening to Bach.
Fluffy was a cat who liked to play with yarn. He also liked to jump.
He would play in the morning, he would play in the evening.
In the common case, the data handled by the tokenization stage comes from the network, but it can also come from script.
You are standing in an open field west of a house.
There is a small mailbox here.
You are standing in an open field west of a house.
There is a small mailbox here.
Pixar has won yet another Best Movie of the Year award, making this its 8th win in the last 12 years.
The latest TWiT episode has been posted, in which we hear several tech news stories as well as learning much more about the iPhone. This week, the panelists compare how reflective their iPhones' Apple logos are.
We have recently been looking at buying the 
ABG company, a small Greek company
specializing in our type of product.
The ABG company has had a good quarter, and our pie chart studies of their accounts suggest a much bigger blue slice than its green and orange slices, which is always a good sign.
Consider for a moment their logo:
How unoriginal can you get? I mean, oooooh, a question mark, how revolutionary, how utterly ground-breaking, I'm sure everyone will rush to adopt those specifications now! They could at least have tried for some sort of, I don't know, sequence of rounded squares with varying shades of green and bold white outlines, at least that would look good on the cover of a blue book.
This example shows how the alternative text should be written such that if the image isn't available, and the text is used instead, the text flows seamlessly into the surrounding text, as if the image had never been there in the first place. 4.8.1.1.5 Text that has been rendered to a graphic for typographical effect Sometimes, an image just consists of text, and the purpose of the image is not to highlight the actual typographic effects used to render the text, but just to convey the text itself. In such cases, the [7317]alt attribute must be present but must consist of the same text as written in the image itself. Consider a graphic containing the text "Earth Day", but with the letters all decorated with flowers and plants. If the text is merely being used as a heading, to spice up the page for graphical users, then the correct alternative text is just the same text "Earth Day", and no mention need be made of the decorations:
The Network passes data to the Input Stream Preprocessor, which passes it to the Tokenizer, which passes it to the Tree Construction stage. From there, data goes to both the DOM and to Script Execution. Script Execution is linked to the DOM, and, using document.write(), passes data to the Tokenizer.
The Network passes data to the Input Stream Preprocessor, which passes it to the Tokenizer, which passes it to the Tree Construction stage. From there, data goes to both the DOM and to Script Execution. Script Execution is linked to the DOM, and, using document.write(), passes data to the Tokenizer.
The Network passes data to the Input Stream Preprocessor, which passes it to the Tokenizer, which passes it to the Tree Construction stage. From there, data goes to both the DOM and to Script Execution. Script Execution is linked to the DOM, and, using document.write(), passes data to the Tokenizer.
The Network passes data to the Input Stream Preprocessor, which passes it to the Tokenizer, which passes it to the Tree Construction stage. From there, data goes to both the DOM and to Script Execution. Script Execution is linked to the DOM, and, using document.write(), passes data to the Tokenizer.
According to a study covering several billion pages, about 62% of documents on the Web in 2007 triggered the Quirks rendering mode of Web browsers, about 30% triggered the Almost Standards mode, and about 9% triggered the Standards mode.
On either side the river lie
Long fields of barley and of rye,
That clothe the wold and meet the sky;
And through the field the road run by
To many-tower'd Camelot;
And up and down the people go,
Gazing where the lilies blow
Round an island there below,
The island of Shalott.
Rating:
You come across a flying spaghetti monster. Which side of His Noodliness do you wish to reach out for?
Note that "sales graph" would be inadequate alternative text for
a sales graph. Text that would be a good caption is not
generally suitable as replacement text.
Images that defy a complete description
In certain cases, the nature of the image might be such that
providing thorough alternative text is impractical. For example,
the image could be indistinct, or could be a complex fractal, or
could be a detailed topographical map.
In these cases, the [7329]alt attribute must contain some
suitable alternative text, but it may be somewhat brief.
Sometimes there simply is no text that can do justice to an
image. For example, there is little that can be said to usefully
describe a Rorschach inkblot test. However, a description, even
if brief, is still better than nothing:
Images whose contents are not known
In some unfortunate cases, there might be no alternative text
available at all, either because the image is obtained in some
automated fashion without any associated alternative text (e.g.
a Webcam), or because the page is being generated by a script
using user-provided images where the user did not provide
suitable or usable alternative text (e.g. photograph sharing
sites), or because the author does not himself know what the
images represent (e.g. a blind photographer sharing an image on
his blog).
In such cases, the [7330]alt attribute may be omitted, but one
of the following conditions must be met as well:
+ The [7331]title attribute is present and has a non-empty
value.
+ The [7332]img element is in a [7333]figure element that
contains a [7334]figcaption element that contains content
other than [7335]inter-element whitespace, and, ignoring the
[7336]figcaption element and its descendants, the [7337]figure
element has no [7338]Text node descendants other than
[7339]inter-element whitespace, and no [7340]embedded content
descendant other than the [7341]img element.
Such cases are to be kept to an absolute minimum. If there is
even the slightest possibility of the author having the ability
to provide real alternative text, then it would not be
acceptable to omit the [7342]alt attribute.
A photo on a photo-sharing site, if the site received the image
with no metadata other than the caption, could be marked up as
follows:
I went out today and took a photo!
I went out today and took a photo!
(If you cannot see the image, you can use an audio test instead.)
Another example would be software that displays images and asks for alternative text precisely for the purpose of then writing a page with correct alternative text. Such a page could have a table of images, like this:| Image | Description |
|---|---|
| |
|
After much effort, I've finally found a publisher, and so now I have my own magazine! Isn't that awesome?! The first issue will come out in September, and we have articles about getting food, and about getting in boxes, it's going to be great!
We're not scared of you! Here is your content, unedited:
It is important to use a separate domain so that if the attacker convinces the user to visit that page directly, the page doesn't run in the context of the site's origin, which would make the user vulnerable to any attack found in the page. In this example, a gadget from another site is embedded. The gadget has scripting and forms enabled, and the origin sandbox restrictions are lifted, allowing the gadget to communicate with its originating server. The sandbox is still useful, however, as it disables plugins and popups, thus reducing the risk of the user being exposed to malware and other annoyances. Suppose a file A contained the following fragment: Suppose that file B contained an iframe also: Further, suppose that file C contained a link: Link For this example, suppose all the files were served as [7594]text/html. Page C in this scenario has all the sandboxing flags set. Scripts are disabled, because the [7595]iframe in A has scripts disabled, and this overrides the [7596]allow-scripts keyword set on the [7597]iframe in B. Forms are also disabled, because the inner [7598]iframe (in B) does not have the [7599]allow-forms keyword set. Suppose now that a script in A removes all the [7600]sandbox attributes in A and B. This would change nothing immediately. If the user clicked the link in C, loading page D into the [7601]iframe in B, page D would now act as if the [7602]iframe in B had the [7603]allow-same-origin and [7604]allow-forms keywords set, because that was the state of the [7605]nested browsing context in the [7606]iframe in A when page B was loaded. Generally speaking, dynamically removing or changing the [7607]sandbox attribute is ill-advised, because it can make it quite hard to reason about what will be allowed and what will not. Potentially hostile files should not be served from the same server as the file containing the [7608]iframe element. Using a different domain ensures that scripts in the files are unable to attack the site, even if the user is tricked into visiting those pages directly, without the protection of the [7609]sandbox attribute. If the [7610]allow-scripts keyword is set along with [7611]allow-same-origin keyword, and the file is from the [7612]same origin as the [7613]iframe's [7614]Document, then a script in the "sandboxed" iframe could just reach out, remove the [7615]sandbox attribute, and then reload itself, effectively breaking out of the sandbox altogether. __________________________________________________________________ The seamless attribute is a [7616]boolean attribute. When specified, it indicates that the [7617]iframe element's [7618]browsing context is to be rendered in a manner that makes it appear to be part of the containing document (seamlessly included in the parent document). Specifically, when the attribute is set on an [7619]iframe element whose owner [7620]Document's [7621]active sandboxing flag set does not have the [7622]sandboxed seamless iframes flag set, and while either the [7623]browsing context's [7624]active document has the [7625]same origin as the [7626]iframe element's document, or the [7627]browsing context's [7628]active document's [7629]address has the [7630]same origin as the [7631]iframe element's document, or the [7632]browsing context's [7633]active document is [7634]an iframe srcdoc document, the following requirements apply: * The user agent must set the seamless browsing context flag to true for that [7635]browsing context. This will [7636]cause links to open in the parent browsing context unless an [7637]explicit self-navigation override is used (target="_self"). * In a CSS-supporting user agent: the user agent must add all the style sheets that apply to the [7638]iframe element to the cascade of the [7639]active document of the [7640]iframe element's [7641]nested browsing context, at the appropriate cascade levels, before any style sheets specified by the document itself. * In a CSS-supporting user agent: the user agent must, for the purpose of CSS property inheritance only, treat the root element of the [7642]active document of the [7643]iframe element's [7644]nested browsing context as being a child of the [7645]iframe element. (Thus inherited properties on the root element of the document in the [7646]iframe will inherit the computed values of those properties on the [7647]iframe element instead of taking their initial values.) * In visual media, in a CSS-supporting user agent: the user agent should set the intrinsic width of the [7648]iframe to the width that the element would have if it was a non-replaced block-level element with 'width: auto'. * In visual media, in a CSS-supporting user agent: the user agent should set the intrinsic height of the [7649]iframe to the height of the bounding box around the content rendered in the [7650]iframe at its current width (as given in the previous bullet point), as it would be if the scrolling position was such that the top of the viewport for the content rendered in the [7651]iframe was aligned with the origin of that content's canvas. * In visual media, in a CSS-supporting user agent: the user agent must force the height of the initial containing block of the [7652]active document of the [7653]nested browsing context of the [7654]iframe to zero. This is intended to get around the otherwise circular dependency of percentage dimensions that depend on the height of the containing block, thus affecting the height of the document's bounding box, thus affecting the height of the viewport, thus affecting the size of the initial containing block. * In speech media, the user agent should render the [7655]nested browsing context without announcing that it is a separate document. * User agents should, in general, act as if the [7656]active document of the [7657]iframe's [7658]nested browsing context was part of the document that the [7659]iframe is in, if any. For example if the user agent supports listing all the links in a document, links in "seamlessly" nested documents would be included in that list without being significantly distinguished from links in the document itself. If the attribute is not specified, or if the [7660]origin conditions listed above are not met, then the user agent should render the [7661]nested browsing context in a manner that is clearly distinguishable as a separate [7662]browsing context, and the [7663]seamless browsing context flag must be set to false for that [7664]browsing context. It is important that user agents recheck the above conditions whenever the [7665]active document of the [7666]nested browsing context of the [7667]iframe changes, such that the [7668]seamless browsing context flag gets unset if the [7669]nested browsing context is [7670]navigated to another origin. The attribute can be set or removed dynamically, with the rendering updating in tandem. In this example, the site's navigation is embedded using a client-side include using an [7671]iframe. Any links in the [7672]iframe will, in new user agents, be automatically opened in the [7673]iframe's parent browsing context; for legacy user agents, the site could also include a [7674]base element with a [7675]target attribute with the value _parent. Similarly, in new user agents the styles of the parent page will be automatically applied to the contents of the frame, but to support legacy user agents authors might wish to include the styles explicitly. __________________________________________________________________ The [7676]iframe element supports [7677]dimension attributes for cases where the embedded content has specific dimensions (e.g. ad units have well-defined dimensions). An [7678]iframe element never has [7679]fallback content, as it will always create a nested [7680]browsing context, regardless of whether the specified initial contents are successfully used. Descendants of [7681]iframe elements represent nothing. (In legacy user agents that do not support [7682]iframe elements, the contents would be parsed as markup that could act as fallback content.) When used in [7683]HTML documents, the allowed content model of [7684]iframe elements is text, except that invoking the [7685]HTML fragment parsing algorithm with the [7686]iframe element as the [7687]context element and the text contents as the input must result in a list of nodes that are all [7688]phrasing content, with no [7689]parse errors having occurred, with no [7690]script elements being anywhere in the list or as descendants of elements in the list, and with all the elements in the list (including their descendants) being themselves conforming. The [7691]iframe element must be empty in [7692]XML documents. The [7693]HTML parser treats markup inside [7694]iframe elements as text. The IDL attributes src, srcdoc, name, sandbox, and seamless must [7695]reflect the respective content attributes of the same name. The contentDocument IDL attribute must return the [7696]Document object of the [7697]active document of the [7698]iframe element's [7699]nested browsing context, if any, or null otherwise. The contentWindow IDL attribute must return the [7700]WindowProxy object of the [7701]iframe element's [7702]nested browsing context, if any, or null otherwise. Here is an example of a page using an [7703]iframe to include advertising from an advertising broker: 4.8.3 The embed element [7704]Categories: [7705]Flow content. [7706]Phrasing content. [7707]Embedded content. [7708]Interactive content. [7709]Palpable content. [7710]Contexts in which this element can be used: Where [7711]embedded content is expected. [7712]Content model: Empty. [7713]Content attributes: [7714]Global attributes [7715]src [7716]type [7717]width [7718]height Any other attribute that has no namespace (see prose). [7719]DOM interface: interface HTMLEmbedElement : [7720]HTMLElement { attribute DOMString [7721]src; attribute DOMString [7722]type; attribute DOMString [7723]width; attribute DOMString [7724]height; [7725]legacycaller any (any... arguments); }; Depending on the type of content instantiated by the [7726]embed element, the node may also support other interfaces. The [7727]embed element [7728]represents an integration point for an external (typically non-HTML) application or interactive content. The src attribute gives the address of the resource being embedded. The attribute, if present, must contain a [7729]valid non-empty URL potentially surrounded by spaces. If the [7730]itemprop is specified on an [7731]embed element, then the [7732]src attribute must also be specified. The type attribute, if present, gives the [7733]MIME type by which the plugin to instantiate is selected. The value must be a [7734]valid MIME type. If both the [7735]type attribute and the [7736]src attribute are present, then the [7737]type attribute must specify the same type as the [7738]explicit Content-Type metadata of the resource given by the [7739]src attribute. When the element is created with neither a [7740]src attribute nor a [7741]type attribute, and when attributes are removed such that neither attribute is present on the element anymore, and when the element has a [7742]media element ancestor, and when the element has an ancestor [7743]object element that is not showing its [7744]fallback content, any plugins instantiated for the element must be removed, and the [7745]embed element represents nothing. An [7746]embed element is said to be potentially active when the following conditions are all met simultaneously: * The element is [7747]in a Document. * The element's [7748]Document is [7749]fully active. * The element has either a [7750]src attribute set or a [7751]type attribute set (or both). * The element's [7752]src attribute is either absent or its value is the empty string. * The element is not a descendant of a [7753]media element. * The element is not a descendant of an [7754]object element that is not showing its [7755]fallback content. * The element is [7756]being rendered. Whenever an [7757]embed element that was not [7758]potentially active becomes [7759]potentially active, and whenever a [7760]potentially active [7761]embed element's [7762]src attribute is set, changed, or removed, and whenever a [7763]potentially active [7764]embed element's [7765]type attribute is set, changed, or removed, the appropriate set of steps from the following is then applied: If the element has a [7766]src attribute set The user agent must [7767]resolve the value of the element's [7768]src attribute, relative to the element. If that is successful, the user agent should [7769]fetch the resulting [7770]absolute URL, from the element's [7771]browsing context scope origin if it has one. The [7772]task that is [7773]queued by the [7774]networking task source once the resource has been [7775]fetched must find and instantiate an appropriate [7776]plugin based on the [7777]content's type, and hand that [7778]plugin the content of the resource, replacing any previously instantiated plugin for the element. Fetching the resource must [7779]delay the load event of the element's document. If the element has no [7780]src attribute set The user agent should find and instantiate an appropriate [7781]plugin based on the value of the [7782]type attribute. Whenever an [7783]embed element that was [7784]potentially active stops being [7785]potentially active, any [7786]plugin that had been instantiated for that element must be unloaded. When a [7787]plugin is to be instantiated but it cannot be [7788]secured and the [7789]sandboxed plugins browsing context flag is set on the [7790]embed element's [7791]Document's [7792]active sandboxing flag set, then the user agent must not instantiate the [7793]plugin, and must instead render the [7794]embed element in a manner that conveys that the [7795]plugin was disabled. The user agent may offer the user the option to override the sandbox and instantiate the [7796]plugin anyway; if the user invokes such an option, the user agent must act as if the conditions above did not apply for the purposes of this element. Plugins that cannot be [7797]secured are disabled in sandboxed browsing contexts because they might not honor the restrictions imposed by the sandbox (e.g. they might allow scripting even when scripting in the sandbox is disabled). User agents should convey the danger of overriding the sandbox to the user if an option to do so is provided. The [7798]embed element is unaffected by the CSS 'display' property. The selected plugin is instantiated even if the element is hidden with a 'display:none' CSS style. The type of the content being embedded is defined as follows: 1. If the element has a [7799]type attribute, and that attribute's value is a type that a [7800]plugin supports, then the value of the [7801]type attribute is the [7802]content's type. 2. Otherwise, if the [7803]