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14.7 Interactive media

User agents are expected to allow the user to control aspects ofhyperlinkp244

activation andform submissionp536

, such as whichbrowsing

contextp748

is to be used for the subsequentnavigationp788

User agents are expected to allow users to discover the destination ofhyperlinksp244

and offormsp429

before triggering theirnavigationp788

User agents are expected to inform the user of whether ahyperlinkp244

includeshyperlink auditingp253

, and to let them know at a minimum which

domains will be contacted as part of such auditing.

User agents may allow users tonavigatep788

browsing contextsp748

to the URLsindicatedp87

by theciteattributes onqp214

,blockquotep191

insp266

, anddelp267

elements.

User agents may surfacehyperlinksp244

created bylinkp138

elements in their user interface.

User agents are expected to expose theadvisory informationp124

of elements upon user request, and to make the user aware of the presence of

such information.

On interactive graphical systems where the user can use a pointing device, this could take the form of a tooltip. When the user is unable to use a

pointing device, then the user agent is expected to make the content available in some other fashion, e.g. by making the element afocusable area

and always displaying theadvisory informationp124

of the currentlyfocusedp713

element, or by showing theadvisory informationp124

of the elements

under the user's finger on a touch device as the user pans around the screen.

U+000A LINE FEED (LF) characters are expected to cause line breaks in the tooltip; U+0009 CHARACTER TABULATION (tab) characters are

expected to render as a non-zero horizontal shift that lines up the next glyph with the next tab stop, with tab stops occurring at points that are

multiples of 8 times the width of a U+0020 SPACE character.

The current text editing caret (i.e. theactive rangep727

, if it is empty and in anediting hostp727

), if any, is expected to act like an inlinereplaced

element

with the vertical dimensions of the caret and with zero width for the purposes of the CSS rendering model.

Whilelinkp138

elements that createhyperlinksp244

will match the:linkp667

or:visitedp667

pseudo-classes

, will react to clicks if visible,

and so forth, this does not extend to any browser interface constructs that expose those same links. Activating a link through the browser's

interface, rather than in the page itself, does not triggerclick

events and the like.

Note

For example, a visual user agent could make elements with atitlep124

attributefocusablep711

, and could make anyfocusedp713

element with atitlep124

attribute show its tooltip under the element while the element has focus. This would allow a user to tab around

the document to find all the advisory text.

Example

As another example, a screen reader could provide an audio cue when reading an element with a tooltip, with an associated key to read

the last tooltip for which a cue was played.

Example

This means that even an empty block can have the caret inside it, and that when the caret is in such an element, it preventsmargins from

collapsing

through the element.

Note

14.7.1 Links, forms, and navigation

14.7.2 Thetitlep124

attribute

14.7.3 Editing hosts

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User agents are expected to honor the Unicode semantics of text that is exposed in user interfaces, for example supporting the bidirectional

algorithm in text shown in dialogs, title bars, pop-up menus, and tooltips. Text from the contents of elements is expected to be rendered in a manner

that honorsthe directionalityp127

of the element from which the text was obtained. Text from attributes is expected to be rendered in a manner that

honours thedirectionality of the attributep128

Consider the following markup, which has Hebrew text asking for a programming language, the languages being text for which a left-to-

right direction is important given the punctuation in some of their names:

<label>

:תונכת תפש רחב

select>

<option dir="ltr">FreePascal</option>

</select>

</label>

</p>

If theselectp479

element was rendered as a drop down box, a correct rendering would ensure that the punctuation was the same both

in the drop down, and in the box showing the current selection.

Example

The directionality of attributes depends on the attribute and on the element'sdirp127

attribute, as the following example demonstrates.

Consider this markup:

<table>

<tr>

<th abbr="(א" dir=ltr>A

<th abbr="(א" dir=rtl>A

<th abbr="(א" dir=auto>A

</table>

If theabbrp411

attributes are rendered, e.g. in a tooltip or other user interface, the first will have a left parenthesis (because the direction

is 'ltr'), the second will have a right parenthesis (because the direction is 'rtl'), and the third will have a right parenthesis (because the

direction is determinedfrom the attribute valueto be 'rtl').

However, if instead the attribute was not adirectionality-capable attributep128

, the results would be different:

<table>

<tr>

<th data-abbr="(א" dir=ltr>A

<th data-abbr="(א" dir=rtl>A

<th data-abbr="(א" dir=auto>A

</table>

In this case, if the user agent were to expose thedata-abbrattribute in the user interface (e.g. in a debugging environment), the last

case would be rendered with aleftparenthesis, because the direction would be determined from the element's contents.

Example

14.7.4 Text rendered in native user interfaces

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A string provided by a script (e.g. the argument towindow.alert()p863

) is expected to be treated as an independent set of one or more

bidirectional algorithm paragraphs when displayed, as defined by the bidirectional algorithm, including, for instance, supporting the paragraph-

breaking behaviour of U+000A LINE FEED (LF) characters. For the purposes of determining the paragraph level of such text in the bidirectional

algorithm, this specification doesnotprovide a higher-level override of rules P2 and P3.[BIDI]p1158

When necessary, authors can enforce a particular direction for a given paragraph by starting it with the Unicode U+200E LEFT-TO-RIGHT MARK or

U+200F RIGHT-TO-LEFT MARK characters.

14.8 Print media

User agents are expected to allow the user to request the opportunity toobtain a physical form(or a representation of a physical form) of a

Documentp103

. For example, selecting the option to print a page or convert it to PDF format.[PDF]p1162

When the user actuallyobtains a physical formp1103

(or a representation of a physical form) of aDocumentp103

, the user agent is expected to create

a new rendering of theDocumentp103

for the print media.

14.9 Unstyled XML documents

HTML user agents may, in certain circumstances, find themselves rendering non-HTML documents that use vocabularies for which they lack any

built-in knowledge. This section provides for a way for user agents to handle such documents in a somewhat useful manner.

While aDocumentp103

is anunstyled documentp1103

, the user agent is expected to renderan unstyled document viewp1104

ADocumentp103

is anunstyled documentwhile it matches the following conditions:

• TheDocumentp103

has no author style sheets (whether referenced by HTTP headers, processing instructions, elements likelinkp138

inline elements likestylep152

, or any other mechanism).

Thus, the following script:

alert('\u05DC\u05DE\u05D3 HTML \u05D4\u05D9\u05D5\u05DD!')

...would always result in a message reading "!םויהHTMLדמל" (not "דמלHTMLםויה!"), regardless of the language of the user agent

interface or the direction of the page or any of its elements.

Example

For a more complex example, consider the following script:

/* Warning: this script does not handle right-to-left scripts correctly */

var s;

if (s = prompt('What is your name?')) {

alert(s + '! Ok, Fred, ' + s + ', and Wilma will get the car.');

}

When the user enters "Kitty", the user agent would alert "Kitty! Ok, Fred, Kitty, and Wilma will get the car.".

However, if the user enters "مهفأ أ 䐧", then the bidirectional algorithm will determine that the direction of the paragraph is right-to-left,

and so the output will be the following unintended mess: ".and d Wilma a will get t the car ,مهفأ 䐧䐧 ,Ok, Fred !مهفأ أ 䐧"

To force an alert that starts with user-provided text (or other text of unknown directionality) to render left-to-right, the string can be

prefixed with a U+200E LEFT-TO-RIGHT MARK character:

var s;

if (s = prompt('What is your name?')) {

alert('

\u200E' + s + '! Ok, Fred, ' + s + ', and Wilma will get the car.');

}

Example

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• None of the elements in theDocumentp103

have anypresentational hintsp1067

• None of the elements in theDocumentp103

have anystyle attributes

• None of the elements in theDocumentp103

are in any of the following namespaces:HTML namespacep97

,SVG namespacep97

,MathML

namespacep97

• TheDocumentp103

has nofocusable area(e.g. from XLink) other than theviewport

• TheDocumentp103

has nohyperlinksp244

(e.g. from XLink).

• There exists noscriptp827

whosesettings objectp827

specifies thisDocumentp103

as theresponsible documentp828

• None of the elements in theDocumentp103

have any registered event listeners.

An unstyled document viewis one where the DOM is not rendered according to CSS (which would, since there are no applicable styles in this

context, just result in a wall of text), but is instead rendered in a manner that is useful for a developer. This could consist of just showing the

Documentp103

object's source, maybe with syntax highlighting, or it could consist of displaying just the DOM tree, or simply a message saying that

the page is not a styled document.

If aDocumentp103

stops being anunstyled documentp1103

, then the conditions above stop applying, and thus a user agent following these

requirements will switch to using the regular CSS rendering.

Note

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15 Obsolete features

15.1 Obsolete but conforming features

Features listed in this section will trigger warnings in conformance checkers.

Authors should not specify aborderp1110

attribute on animgp280

element. If the attribute is present, its value must be the string "0". CSS should be

used instead.

Authors should not specify alanguagep1108

attribute on ascriptp564

element. If the attribute is present, its value must be anASCII case-

insensitivep63

match for the string "JavaScript" and either thetypep565

attribute must be omitted or its value must be anASCII case-

insensitivep63

match for the string "text/javascript". The attribute should be entirely omitted instead (with the value "JavaScript", it has no

effect), or replaced with use of thetypep565

attribute.

Authors should not specify thenamep1107

attribute onap207

elements. If the attribute is present, its value must not be the empty string and must

neither be equal to the value of any of theIDs

in the element'stree

other than the element's ownID

, if any, nor be equal to the value of any of the

othernamep1107

attributes onap207

elements in the element'stree

. If this attribute is present and the element has anID

, then the attribute's value

must be equal to the element'sID

. In earlier versions of the language, this attribute was intended as a way to specify possible targets forfragments

inURLs

. Theidp122

attribute should be used instead.

Authors should not, but may despite requirements to the contrary elsewhere in this specification, specify themaxlengthp463

andsizep463

attributes oninputp434

elements whosetypep436

attributes are in theNumberp450

state. One valid reason for using these attributes regardless is to

help legacy user agents that do not supportinputp434

elements withtype="number"to still render the text field with a useful width.

To ease the transition from HTML4 Transitional documents to the language defined inthisspecification, and to discourage certain features that are

only allowed in very few circumstances, conformance checkers must warn the user when the following features are used in a document. These are

generally old obsolete features that have no effect, and are allowed only to distinguish between likely mistakes (regular conformance errors) and

mere vestigial markup or unusual and discouraged practices (these warnings).

The following features must be categorised as described above:

• The presence of anobsolete permitted DOCTYPEp952

in anHTML document

• The presence of aborderp1110

attribute on animgp280

element if its value is the string "0".

• The presence of alanguagep1108

attribute on ascriptp564

element if its value is anASCII case-insensitivep63

match for the string

"JavaScript" and if there is notypep565

attribute or there is and its value is anASCII case-insensitivep63

match for the string "text/

javascript".

• The presence of anamep1107

attribute on anap207

element, if its value is not the empty string.

• The presence of amaxlengthp463

attribute on aninputp434

element whosetypep436

attribute is in theNumberp450

state.

• The presence of asizep463

attribute on aninputp434

element whosetypep436

attribute is in theNumberp450

state.

Conformance checkers must distinguish between pages that have no conformance errors and have none of these obsolete features, and pages that

have no conformance errors but do have some of these obsolete features.

Inthe HTML syntaxp951

, specifying aDOCTYPEp951

that is anobsolete permitted DOCTYPEp952

will also trigger a warning.

Note

For example, a validator could report some pages as "Valid HTML" and others as "Valid HTML with warnings".

Example

15.1.1 Warnings for obsolete but conforming features

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15.2 Non-conforming features

Elements in the following list are entirely obsolete, and must not be used by authors:

appletp1111

Useembedp315

orobjectp318

instead.

acronym

Useabbrp217

instead.

bgsound

Useaudiop329

instead.

dir

Useulp196

instead.

framep1115

framesetp1114

noframes

Either useiframep308

and CSS instead, or use server-side includes to generate complete pages with the various invariant parts merged in.

isindex

Use an explicitformp429

andtext fieldp440

combination instead.

listing

Useprep190

andcodep230

instead.

nextid

Use GUIDs instead.

noembed

Useobjectp318

instead ofembedp315

when fallback is necessary.

plaintext

Use the "text/plain

"MIME typep43

instead.

rtc

Providing the ruby base directly inside therubyp218

element or using nestedrubyp218

elements is sufficient.

strike

Usedelp267

instead if the element is marking an edit, otherwise usesp213

instead.

xmp

Useprep190

andcodep230

instead, and escape "<" and "&" characters as "<" and "&" respectively.

1106

basefont

big

blink

center

font

marqueep1112

multicol

nobr

spacer

Use appropriate elements or CSS instead.

Where thettp1107

element would have been used for marking up keyboard input, consider thekbdp233

element; for variables, consider the

varp231

element; for computer code, consider thecodep230

element; and for computer output, consider thesampp232

element.

Similarly, if thebigp1107

element is being used to denote a heading, consider using theh1p167

element; if it is being used for marking up

important passages, consider thestrongp210

element; and if it is being used for highlighting text for reference purposes, consider the

markp237

element.

See also thetext-level semantics usage summaryp243

for more suggestions with examples.

The following attributes are obsolete (though the elements are still part of the language), and must not be used by authors:

charsetonap207

elements

charsetonlinkp138

elements

Use an HTTP `Content-Typep88

` header on the linked resource instead.

coordsonap207

elements

shapeonap207

elements

Useareap387

instead ofap207

for image maps.

methodsonap207

elements

methodsonlinkp138

elements

Use the HTTP OPTIONS feature instead.

nameonap207

elements (except as noted in the previous section)

nameonembedp315

elements

nameonimgp280

elements

nameonoptionp486

elements

Use theidp122

attribute instead.

revonap207

elements

revonlinkp138

elements

Use therelp245

attribute instead, with an opposite term. (For example, instead ofrev="made", userel="author".)

urnonap207

elements

urnonlinkp138

elements

Specify the preferred persistent identifier using thehrefp244

attribute instead.

acceptonformp429

elements

Use theacceptp457

attribute directly on theinputp434

elements instead.

1107

hreflangonareap387

elements

typeonareap387

elements

These attributes do not do anything useful, and for historical reasons there are no corresponding IDL attributes onareap387

elements. Omit

them altogether.

nohrefonareap387

elements

Omitting thehrefp244

attribute is sufficient; thenohrefp1108

attribute is unnecessary. Omit it altogether.

profileonheadp135

elements

When used for declaring whichmetap143

terms are used in the document, unnecessary; omit it altogether, andregister the namesp147

When used for triggering specific user agent behaviours: use alinkp138

element instead.

versiononhtmlp134

elements

Unnecessary. Omit it altogether.

ismaponinputp434

elements

Unnecessary. Omit it altogether. Allinputp434

elements with atypep436

attribute in theImage Buttonp460

state are processed as server-side

image maps.

usemaponinputp434

elements

Useimgp280

instead ofinputp434

for image maps.

longdesconiframep308

elements

longdesconimgp280

elements

Use a regularap207

element to link to the description, or (in the case of images) use animage mapp389

to provide a link from the image to the

image's description.

lowsrconimgp280

elements

Use a progressive JPEG image (given in thesrcp281

attribute), instead of using two separate images.

targetonlinkp138

elements

Unnecessary. Omit it altogether.

schemeonmetap143

elements

Use only one scheme per field, or make the scheme declaration part of the value.

archiveonobjectp318

elements

classidonobjectp318

elements

codeonobjectp318

elements

codebaseonobjectp318

elements

codetypeonobjectp318

elements

Use thedatap319

andtypep319

attributes to invokepluginsp44

. To set parameters with these names in particular, theparamp324

element can

be used.

declareonobjectp318

elements

Repeat theobjectp318

element completely each time the resource is to be reused.

standbyonobjectp318

elements

Optimise the linked resource so that it loads quickly or, at least, incrementally.

typeonparamp324

elements

valuetypeonparamp324

elements

Use thenamep324

andvaluep324

attributes without declaring value types.

languageonscriptp564

elements (except as noted in the previous section)

Use thetypep565

attribute instead.

1108

eventonscriptp564

elements

foronscriptp564

elements

Use DOM events mechanisms to register event listeners.[DOM]p1160

datapagesizeontablep394

elements

Unnecessary. Omit it altogether.

summaryontablep394

elements

Use one of thetechniques for describing tablesp398

given in thetablep394

section instead.

abbrontdp409

elements

Use text that begins in an unambiguous and terse manner, and include any more elaborate text after that. Thetitlep124

attribute can also

be useful in including more detailed text, so that the cell's contents can be made terse. If it's a heading, usethp410

(which has anabbrp411

attribute).

axisontdp409

andthp410

elements

Use thescopep410

attribute on the relevantthp410

scopeontdp409

elements

Usethp410

elements for heading cells.

datasrconap207

,appletp1111

,buttonp476

,divp206

,framep1115

,iframep308

,imgp280

,inputp434

,labelp432

,legendp507

,marqueep1112

objectp318

,optionp486

,selectp479

,spanp241

,tablep394

, andtextareap489

elements

datafldonap207

,appletp1111

,buttonp476

,divp206

,fieldsetp505

,framep1115

,iframep308

,imgp280

,inputp434

,labelp432

,legendp507

marqueep1112

,objectp318

,paramp324

,selectp479

,spanp241

, andtextareap489

elements

dataformatasonbuttonp476

,divp206

,inputp434

,labelp432

,legendp507

,marqueep1112

,objectp318

,optionp486

,selectp479

,spanp241

, and

tablep394

elements

Use script and a mechanism such asXMLHttpRequest

to populate the page dynamically.[XHR]p1165

1109

alinkonbodyp156

elements

bgcoloronbodyp156

elements

bottommarginonbodyp156

elements

leftmarginonbodyp156

elements

linkonbodyp156

elements

marginheightonbodyp156

elements

marginwidthonbodyp156

elements

rightmarginonbodyp156

elements

textonbodyp156

elements

margintoponbodyp156

elements

vlinkonbodyp156

elements

clearonbrp241

elements

alignoncaptionp402

elements

alignoncolp403

elements

charoncolp403

elements

charoffoncolp403

elements

valignoncolp403

elements

widthoncolp403

elements

alignondivp206

elements

compactondlp198

elements

alignonembedp315

elements

hspaceonembedp315

elements

vspaceonembedp315

elements

alignonhrp188

elements

coloronhrp188

elements

noshadeonhrp188

elements

sizeonhrp188

elements

widthonhrp188

elements

alignonh1p167

—h6p167

elements

alignoniframep308

elements

allowtransparencyoniframep308

elements

frameborderoniframep308

elements

framespacingoniframep308

elements

hspaceoniframep308

elements

marginheightoniframep308

elements

marginwidthoniframep308

elements

scrollingoniframep308

elements

vspaceoniframep308

elements

alignoninputp434

elements

borderoninputp434

elements

hspaceoninputp434

elements

vspaceoninputp434

elements

alignonimgp280

elements

borderonimgp280

elements (except as noted in the previous section)

hspaceonimgp280

elements

vspaceonimgp280

elements

alignonlegendp507

elements

typeonlip196

elements

compactonmenup548

elements

alignonobjectp318

elements

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