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Generally speaking, there is no good way to indicate more complicated edits (e.g. that a cell was removed, moving all subsequent cells up or to the

left).

4.8 Embedded content

This section is non-normative.

To embed an image in HTML, when there is only a single image resource, use theimgp280

element and itssrcp281

attribute.

However, there are a number of situations for which the author might wish to use multiple image resources that the user agent can choose from:

• Different users might have different environmental characteristics:

◦ The users' physical screen size might be different from one another.

◦ The users' screen pixel density might be different from one another.

<tr> <td> Portal 2 <td> Valve <td>

<del cite="/edits/r192"

datetime="2011-05-02 14:23Z">10/10</del>

</table>

<h2>From today's featured article</h2>

<p><b><a href="/wiki/Marie_Lloyd">Marie Lloyd</a></b> (1870–1922)

was an English <a href="/wiki/Music_hall">music hall</a> singer, ...

Example

A mobile phone's screen might be 4 inches diagonally, while a laptop's screen might be 14 inches diagonally.

4″

14″

Example

This is only relevant when an image's rendered size depends on theviewport

size.

Note

A mobile phone's screen might have three times as many physical pixels per inch compared to another mobile

phone's screen, regardless of their physical screen size.

Example

4.8.1 Introduction

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◦ The users' zoom level might be different from one another, or might change for a single user over time.

The zoom level and the screen pixel density (the previous point) can both affect the number of physical screen pixels per

CSS pixel

. This ratio is usually referred to asdevice-pixel-ratio.

◦ The users' screen orientation might be different from one another, or might change for a single user over time.

◦ The users' network speed, network latency and bandwidth cost might be different from one another, or might change for a

single user over time.

• Authors might want to show the same image content but with different rendered size depending on, usually, the width of theviewport

This is usually referred to asviewport-based selection.

A user might zoom in to a particular image to be able to get a more detailed look.

Example

A tablet can be held upright or rotated 90 degrees, so that the screen is either "portrait" or "landscape".

Portrait

Landscape

Example

A user might be on a fast, low-latency and constant-cost connection while at work, on a slow, low-latency and

constant-cost connection while at home, and on a variable-speed, high-latency and variable-cost connection

anywhere else.

Example

A Web page might have a banner at the top that always spans the entireviewport

width. In this case, the rendered size of the

image depends on the physical size of the screen (assuming a maximised browser window).

Example

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• Authors might want to show different image content depending on the rendered size of the image. This is usually referred to asart

direction.

• Authors might want to show the same image content but using different image formats, depending on which image formats the user

agent supports. This is usually referred to asimage format-based selection.

The above situations are not mutually exclusive. For example, it is reasonable to combine different resources for differentdevice-pixel-ratiop272

with

different resources forart directionp273

While it is possible to solve these problems using scripting, doing so introduces some other problems:

• Some user agents aggressively download images specified in the HTML markup, before scripts have had a chance to run, so that Web

pages complete loading sooner. If a script changes which image to download, the user agent will potentially start two separate

downloads, which can instead cause worse page loading performance.

• If the author avoids specifying any image in the HTML markup and instead instantiates a single download from script, that avoids the

double download problem above but then no image will be downloaded at all for users with scripting disabled and the aggressive image

downloading optimisation will also be disabled.

With this in mind, this specification introduces a number of features to address the above problems in a declarative manner.

Another Web page might have images in columns, with a single column for screens with a small physical size, two columns

for screens with medium physical size, and three columns for screens with big physical size, with the images varying in

rendered size in each case to fill up theviewport

. In this case, the rendered size of an image might bebiggerin the one-

column layout compared to the two-column layout, despite the screen being smaller.

Narrow, 1 column

Medium, 2 columns

Wide, 3 columns

When a Web page is viewed on a screen with a large physical size (assuming a maximised browser window), the author

might wish to include some less relevant parts surrounding the critical part of the image. When the same Web page is viewed

on a screen with a small physical size, the author might wish to show only the critical part of the image.

Example

A Web page might have some images in the JPEG, WebP and JPEG XR image formats, with the latter two having better

compression abilities compared to JPEG. Since different user agents can support different image formats, with some formats

offering better compression ratios, the author would like to serve the better formats to user agents that support them, while

providing JPEG fallback for user agents that don't.

Example

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Device-pixel-ratiop272

-based selection when the rendered size of the image is fixed

Thesrcp281

andsrcsetp281

attributes on theimgp280

element can be used, using thexdescriptor, to provide multiple images that only vary

in their size (the smaller image is a scaled-down version of the bigger image).

Viewport-based selectionp272

Thesrcsetp281

andsizesp282

attributes can be used, using thewdescriptor, to provide multiple images that only vary in their size (the

smaller image is a scaled-down version of the bigger image).

Thexdescriptor is not appropriate when the rendered size of the image depends on theviewport

width (viewport-based

selectionp272

), but can be used together withart directionp273

Note

<h2>From today's featured article</h2>

<img

src="/uploads/100-marie-lloyd.jpg"

srcset="/uploads/150-marie-lloyd.jpg 1.5x, /uploads/200-marie-lloyd.jpg 2x"

alt="" width="100" height="150">

<p><b><a href="/wiki/Marie_Lloyd">Marie Lloyd</a></b> (1870–1922)

was an English <a href="/wiki/Music_hall">music hall</a> singer, ...

The user agent can choose any of the given resources depending on the user's screen's pixel density, zoom level, and possibly

other factors such as the user's network conditions.

For backwards compatibility with older user agents that don't yet understand thesrcsetp281

attribute, one of the URLs is

specified in theimgp280

element'ssrcp281

attribute. This will result in something useful (though perhaps lower-resolution than the

user would like) being displayed even in older user agents. For new user agents, thesrcp281

attribute participates in the resource

selection, as if it was specified insrcsetp281

with a1xdescriptor.

The image's rendered size is given in thewidthp393

andheightp393

attributes, which allows the user agent to allocate space for

the image before it is downloaded.

Example

In this example, a banner image takes up the entireviewport

width (using appropriate CSS).

<h1><img

sizes="100vw" srcset="wolf-400.jpg 400w, wolf-800.jpg 800w, wolf-1600.jpg 1600w"

src="wolf-400.jpg" alt="The rad wolf"></h1>

The user agent will calculate the effective pixel density of each image from the specifiedwdescriptors and the specified rendered

size in thesizesp282

attribute. It can then choose any of the given resources depending on the user's screen's pixel density,

zoom level, and possibly other factors such as the user's network conditions.

If the user's screen is 320CSS pixels

wide, this is equivalent to specifyingwolf-400.jpg 1.25x, wolf-800.jpg 2.5x,

wolf-1600.jpg 5x. On the other hand, if the user's screen is 1200CSS pixels

wide, this is equivalent to specifying

wolf-400.jpg 0.33x, wolf-800.jpg 0.67x, wolf-1600.jpg 1.33x. By using the wdescriptors and thesizesp282

attribute, the user agent can choose the correct image source to download regardless of how large the user's device is.

For backwards compatibility, one of the URLs is specified in theimgp280

element'ssrcp281

attribute. In new user agents, the

srcp281

attribute is ignored when thesrcsetp281

attribute useswdescriptors.

Example

In this example, the Web page has three layouts depending on the width of theviewport

. The narrow layout has one column of

images (the width of each image is about 100%), the middle layout has two columns of images (the width of each image is about

50%), and the widest layout has three columns of images, and some page margin (the width of each image is about 33%). It

breaks between these layouts when theviewport

is30emwide and50emwide, respectively.

<img

sizes="(max-width: 30em) 100vw, (max-width: 50em) 50vw, calc(33vw - 100px)"

srcset="swing-200.jpg 200w, swing-400.jpg 400w, swing-800.jpg 800w, swing-1600.jpg

1600w"

src="swing-400.jpg" alt="Kettlebell Swing">

Thesizesp282

attribute sets up the layout breakpoints at30emand50em, and declares the image sizes between these

breakpoints to be100vw,50vw, orcalc(33vw - 100px). These sizes do not necessarily have to match up exactly with the

actual image width as specified in the CSS.

Example

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Art directionp273

-based selection

Thepicturep277

element and thesourcep278

element, together with themediap278

attribute, can be used, to provide multiple images that

vary the image content (for instance the smaller image might be a cropped version of the bigger image).

Image format-based selectionp273

Thetypep278

attribute on thesourcep278

element can be used, to provide multiple images in different formats.

The user agent will pick a width from thesizesp282

attribute, using the first item with a<media-condition>

(the part in

parentheses) that evaluates to true, or using the last item (calc(33vw - 100px)) if they all evaluate to false.

For example, if theviewport

width is29em, then(max-width: 30em)evaluates to true and100vwis used, so the image size,

for the purpose of resource selection, is29em. If theviewport

width is instead32em, then(max-width: 30em)evaluates to

false, but(max-width: 50em)evaluates to true and50vwis used, so the image size, for the purpose of resource selection, is

16em(half theviewport

width). Notice that the slightly widerviewport

results in a smaller image because of the different layout.

The user agent can then calculate the effective pixel density and choose an appropriate resource similarly to the previous

example.

<source

media="(min-width: 45em)" srcset="large.jpg">

<source

media="(min-width: 32em)" srcset="med.jpg">

</picture>

The user agent will choose the firstsourcep278

element for which the media query in themediap278

attribute matches, and then

choose an appropriate URL from itssrcsetp278

attribute.

The rendered size of the image varies depending on which resource is chosen. To specify dimensions that the user agent can use

before having downloaded the image, CSS can be used.

img { width: 300px; height: 300px }

@media (min-width: 32em) { img { width: 500px; height:300px } }

@media (min-width: 45em) { img { width: 700px; height:400px } }

Example

CSS

This example combinesart directionp273

- anddevice-pixel-ratiop272

-based selection. A banner that takes half theviewport

provided in two versions, one for wide screens and one for narrow screens.

<h1>

</picture>

</h1>

Example

<h2>From today's featured article</h2>

<source srcset="/uploads/100-marie-lloyd.webp"

type="image/webp">

<source srcset="/uploads/100-marie-lloyd.jxr"

type="image/vnd.ms-photo">

</picture>

<p><b><a href="/wiki/Marie_Lloyd">Marie Lloyd</a></b> (1870–1922)

was an English <a href="/wiki/Music_hall">music hall</a> singer, ...

In this example, the user agent will choose the first source that has atypep278

attribute with a supported MIME type. If the user

agent supports WebP images, the firstsourcep278

element will be chosen. If not, but the user agent does support JPEG XR

images, the secondsourcep278

element will be chosen. If neither of those formats are supported, theimgp280

element will be

chosen.

Example

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4.8.1.1 Adaptive images

This section is non-normative.

CSS and media queries can be used to construct graphical page layouts that adapt dynamically to the user's environment, in particular to different

viewport

dimensions and pixel densities. For content, however, CSS does not help; instead, we have theimgp280

element'ssrcsetp281

attribute

and thepicturep277

element. This section walks through a sample case showing how to use these features.

Consider a situation where on wide screens (wider than 600CSS pixels

) a 300×150 image nameda-rectangle.pngis to be used, but on

smaller screens (600CSS pixels

and less), a smaller 100×100 image calleda-square.pngis to be used. The markup for this would look like this:

</picture>

<figcaption>Barney Frank, 2011</figcaption>

</figure>

The problem with this is that the user agent does not necessarily know what dimensions to use for the image when the image is loading. To avoid

the layout having to be reflowed multiple times as the page is loading, CSS and CSS media queries can be used to provide the dimensions:

<style>

#a { width: 300px; height: 150px; }

@media (max-width: 600px) { #a { width: 100px; height: 100px; } }

</style>

</picture>

<figcaption>Barney Frank, 2011</figcaption>

</figure>

Alternatively, thewidthp393

andheightp393

attributes can be used to provide the width for legacy user agents, using CSS just for the user agents

that supportpicturep277

#a { width: 100px; height: 100px; }

</style>

<img src="a-rectangle.png" width="300" height="150"

alt="Barney Frank wears a suit and glasses." id="a">

</picture>

<figcaption>Barney Frank, 2011</figcaption>

</figure>

Theimgp280

element is used with thesrcp281

attribute, which gives the URL of the image to use for legacy user agents that do not support the

picturep277

element. This leads to a question of which image to provide in thesrcp281

attribute.

If the author wants the biggest image in legacy user agents, the markup could be as follows:

</picture>

For details on what to put in thealtp281

attribute, see theRequirements for providing text to act as an alternative for imagesp297

section.

Note

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However, if legacy mobile user agents are more important, one can list all three images in thesourcep278

elements, overriding thesrcp281

attribute

entirely.

</picture>

Since at this point thesrcp281

attribute is actually being ignored entirely bypicturep277

-supporting user agents, thesrcp281

attribute can default

to any image, including one that is neither the smallest nor biggest:

</picture>

Above themax-widthmedia feature is used, giving the maximum (viewport

) dimensions that an image is intended for. It is also possible to use

min-widthinstead.

</picture>

Categoriesp114:

Flow contentp117

Phrasing contentp117

Embedded contentp118

Contexts in which this element can be usedp114:

Whereembedded contentp118

is expected.

Content modelp114:

Zero or moresourcep278

elements, followed by oneimgp280

element, optionally intermixed withscript-supporting elementsp119

Tag omission in text/htmlp114:

Neither tag is omissible.

Content attributesp114:

Global attributesp121

DOM interfacep114:

interface HTMLPictureElement : HTMLElement

{};

Thepicturep277

element is a container which provides multiple sources to its containedimgp280

element to allow authors to declaratively control

or give hints to the user agent about which image resource to use, based on the screen pixel density,viewport

size, image format, and other

factors. Itrepresentsp112

its children.

Thepicturep277

element is somewhat different from the similar-lookingvideop325

andaudiop329

elements. While all of them contain

sourcep278

elements, thesourcep278

element'ssrcp279

attribute has no meaning when the element is nested within apicturep277

Note

IDL

4.8.2 Thepictureelement

Support:

Chrome

38+

Chrome for Android

50+

UC Browser for

Android

None

iOS Safari

9.3+

Firefox

38+

None

Opera Mini

None

Android Browser

50+

Edge

13+

Safari

9.1+

Opera

25+

IE Mobile

None

Source:caniuse.com

⋰

277

Categoriesp114:

None.

Contexts in which this element can be usedp114:

As a child of apicturep277

element, before theimgp280

element.

As a child of amedia elementp333

, before anyflow contentp117

ortrackp330

elements.

Content modelp114:

Nothingp115

Tag omission in text/htmlp114:

Noend tagp954

Content attributesp114:

Global attributesp121

srcp279

— Address of the resource

typep278

— Type of embedded resource

srcsetp278

— Images to use in different situations (e.g. high-resolution displays, small monitors, etc)

sizesp278

— Image sizes for different page layouts

mediap278

— Applicable media

DOM interfacep114:

interface HTMLSourceElement : : HTMLElement

{

[CEReactions

] attribute DOMString src

;

[CEReactions

] attribute DOMString type

;

[CEReactions

] attribute DOMString srcset

;

[CEReactions

] attribute DOMString sizes

;

[CEReactions

] attribute DOMString media

;

};

Thesourcep278

element allows authors to specify multiple alternativesource setsp288

forimgp280

elements or multiple alternativemedia

resourcesp334

formedia elementsp333

. It does notrepresentp112

anything on its own.

Thetypeattribute may be present. If present, the value must be avalid MIME typep43

The remainder of the requirements depend on whether the parent is apicturep277

element or amedia elementp333

↪

sourcep278

element's parent is apicturep277

element

Thesrcsetattribute must be present, and must consist of one or moreimage candidate stringsp281

, each separated from the next by a

U+002C COMMA character (,). If animage candidate stringp281

contains no descriptors and nospace charactersp64

after the URL, the

followingimage candidate stringp281

, if there is one, must begin with one or morespace charactersp64

If thesrcsetp278

attribute has anyimage candidate stringsp281

using awidth descriptorp282

, thesizesattribute must also be present,

and the value must be avalid source size listp282

Themediaattributes may also be present. If present, the value must contain avalid media query listp86

Thetypep278

gives the type of the images in thesource setp288

, to allow the user agent to skip to the nextsourcep278

element if it does

not support the given type.

element, and the resource selection algorithm is different. Also, thepicturep277

element itself does not display anything; it merely

provides a context for its containedimgp280

element that enables it to choose from multipleURLs

If thetypep278

attribute isnotspecified, the user agent will not select a differentsourcep278

element if it finds that it does not

support the image format after fetching it.

Note

IDL

4.8.3 Thesourceelement

278

When asourcep278

element has a following siblingsourcep278

element orimgp280

element with asrcsetp281

attribute specified, it

must have at least one of the following:

• Amediap278

attribute specified with a value that, afterstripping leading and trailing whitespacep64

, is not the empty string and

is not anASCII case-insensitivep63

match for the string "all".

• Atypep278

attribute specified.

Thesrcp279

attribute must not be present.

↪

sourcep278

element's parent is amedia elementp333

Thesrcattribute gives theURL

of themedia resourcep334

. The value must be avalid non-empty URL potentially surrounded by

spacesp86

. This attribute must be present.

Thetypep278

attribute gives the type of themedia resourcep334

, to help the user agent determine if it can play thismedia resourcep334

before fetching it. Thecodecsparameter, which certain MIME types define, might be necessary to specify exactly how the resource is

encoded.[RFC6381]p1163

Dynamically modifying asourcep278

element and its attribute when the element is already inserted in avideop325

audiop329

element will have no effect. To change what is playing, just use thesrcp335

attribute on themedia elementp333

directly, possibly making use of thecanPlayType()p336

method to pick from amongst available resources. Generally,

manipulatingsourcep278

elements manually after the document has been parsed is an unnecessarily complicated approach.

Note

The following list shows some examples of how to use thecodecs=MIME parameter in thetypep278

attribute.

H.264 Constrained baseline profile video (main and extended video compatible) level 3 and Low-Complexity AAC

audio in MP4 container

H.264 Extended profile video (baseline-compatible) level 3 and Low-Complexity AAC audio in MP4 container

H.264 Main profile video level 3 and Low-Complexity AAC audio in MP4 container

H.264 'High' profile video (incompatible with main, baseline, or extended profiles) level 3 and Low-Complexity AAC

audio in MP4 container

MPEG-4 Visual Simple Profile Level 0 video and Low-Complexity AAC audio in MP4 container

MPEG-4 Advanced Simple Profile Level 0 video and Low-Complexity AAC audio in MP4 container

MPEG-4 Visual Simple Profile Level 0 video and AMR audio in 3GPP container

Theora video and Vorbis audio in Ogg container

Theora video and Speex audio in Ogg container

Example

279

Thesrcsetp278

,sizesp278

, andmediap278

attributes must not be present.

If asourcep278

element is insertedp43

as a child of amedia elementp333

that has nosrcp335

attribute and whosenetworkStatep337

has the value

NETWORK_EMPTYp337

, the user agent must invoke themedia elementp333

'sresource selection algorithmp338

The IDL attributessrc,type,srcset,sizesandmediamustreflectp89

the respective content attributes of the same name.

Categoriesp114:

Flow contentp117

Phrasing contentp117

Embedded contentp118

Form-associated elementp428

If the element has ausemapp389

attribute:Interactive contentp118

Palpable contentp118

Contexts in which this element can be usedp114:

Whereembedded contentp118

is expected.

Content modelp114:

Nothingp115

Vorbis audio alone in Ogg container

Speex audio alone in Ogg container

FLAC audio alone in Ogg container

Dirac video and Vorbis audio in Ogg container

If the author isn't sure if user agents will all be able to render the media resources provided, the author can listen to theerrorp1154

event on the lastsourcep278

element and trigger fallback behaviour:

function fallback(video) {

// replace <video> with its contents

while (video.hasChildNodes()) {

if (video.firstChild instanceof HTMLSourceElement)

video.removeChild(video.firstChild);

else

video.parentNode.insertBefore(video.firstChild, video);

}

video.parentNode.removeChild(video);

}

</script>

<source src='video.ogv' type='video/ogg; codecs="theora, vorbis"'

onerror="fallback(parentNode)">

...

</video>

Example

4.8.4 Theimgelement

Spec bugs:24055

,26068

28096

⋰

280

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