W3C 发表 HTML 5.1 网页推荐规范
负责制定Web标准的World Wide Web Consortium (W3C)正式发表了HTML5.1推荐规格,规格定义了HTML语言第五大版本的第一个小版本。
W3C已在着手制定下个版本HTML5.2,计划2017年下半年发表并替换此次HTML5.1的规格。
这里摘出HTML5.1和HTML5之间的改变部分:
功能添加
The
picture
andsrcset
attributes allow responsive image selection.The
details
andsummary
elements enable authors to provide extended information that users can choose whether to read.The
menuitem
andtype="context"
attribute value enable authors to add functionality to the browser’s context menu.The
requestAnimationFrame
API allows for more efficient animation.enqueueJob
andnextJob
help explain Promise resolution in terms of microtasks.The
rev
attribute for links, primarily to support RDFa (previously defined in HTML 4).HTMLMediaElement
andsrcObject
objects.Enable cross-origin
track
andEventSource
and cross-origin content forImageBitmap
incanvas
.event-source-error
,event-track-error
andevent-track-load
events for media fetching.onrejectionhandled
andonunhandledrejection
and APIs for tracking promise rejection.HTMLTableCaptionElement
,HTMLTableSectionElement
,HTMLTableRowElement
, for HTML table elements.history.scrollRestoration
to control where a users' view is directed when navigating through their history.IDL
[SameObject]
, for some objects that return collections.Add "noopener" to
rel
andwindow
to allow for browsing contexts to be separated.nonce
attribute onscript
andstyle
to support the use of Content Security Policy.
功能移除
appCache
.Media Controllers.
The
command
API.The
usemap
attribute onobject
.The
accessKeyLabel
IDL attribute.The
form
attribute is no longer valid forlabel
.The
multiple
attribute oninput type="range"
.hreflang
andtype
attributes onarea
.The use of nested
section
elements each with anh1
to create an outline.Special handling of
isindex
in form submission.navigator.yieldForStorageUpdates()
and the Storage mutex.Disallow
tfoot
beforetbody
.[Exposed=Window]
for HTMLHyperLinkElementUtils,[Exposed=Window, Worker]
for DOMStringMap and IDLDate
.
现有功能调整
The
accesskey
takes a single character as a value (as in HTML 4).header
andfooter
elements can be nested, if each level is within a sectioning element.option
elements can be empty.The
mousewheel
event is calledwheel
.The
value
attribute ofinput type="submit"
is translatable.A
figcaption
can appear anywhere within afigure
.Having
title
, or writing email to a friend does not make animg
missingalt
conformant.The content of
time
is phrasing content, or text.Blank
alt
onarea
elements with duplicatehref
attributes is no longer conformant.When navigating internally, the next search for a link etc starts from where the navigation moved to.
img
and related elements supportwidth="0"
..tFoot
and.createTFoot()
always insert at the end of a tablefieldset
andnamedItem
makeHTMLCollection
s notHTMLFormControlsCollection
s andHTMLOptionsCollection
s.frameElement
can returnnull
.For images which don’t resolve
currentSrc
is the URL given to the resolver, not necessarily the absolute URL.script
IDL attributes reflect.meta refresh
allows;
orurl=
to be optional.navigator.javaEnabled()
is a method.fileCallback
is calledblobcallback
.The
toBlob()
callback is non-nullable.origin
onHTMLHyperlinkElementUtils
andLocation
is readonly.The first
title
child of an SVG is its title, not the last.window.open()
can returnnull
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本文标题:W3C 发表 HTML 5.1 网页推荐规范
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