itemid (attribute) - [ HTML 中文开发手册 ] - 在线原生手册

目录搜索

Attributes accesskey (attribute)class (attribute)contenteditable (attribute)contextmenu (attribute)data-* (attribute)dir (attribute)draggable (attribute)dropzone (attribute)Global attributes hidden (attribute)id (attribute)itemid (attribute)itemprop (attribute)itemref (attribute)itemscope (attribute)itemtype (attribute)lang (attribute)slot (attribute)spellcheck (attribute)style (attribute)tabindex (attribute)title (attribute)translate (attribute)Elements a abbr address area article aside audio b base bdi bdo blockquote body br button canvas caption cite code col colgroup data datalist dd del details dfn dialog div dl dt em embed fieldset figcaption figure footer form h1 head header hr html i iframe img input input type="button"input type="checkbox"input type="color"input type="date"input type="datetime"-local input type="email"input type="file"input type="hidden"input type="image"input type="month"input type="number"input type="password"input type="radio"input type="range"input type="reset"input type="search"input type="submit"input type="tel"input type="text"input type="time"input type="url"input type="week"ins kbd label legend li link main map mark menu menuitem meta meter nav noscript object ol optgroup option output p param picture pre progress q rp rt rtc ruby s samp script section select slot small source span strong style sub summary sup table tbody td template textarea tfoot th thead time title tr track u ul var video wbr Miscellaneous Attributes Block-level elements CORS enabled image CORS settings attributes Element Inline elements Kinds of HTML content Link types Microdata Optimizing your pages for speculative parsing Preloading content Reference Supported media formats Using the application cache Obsolete acronym applet basefont big blink center command content dir element font frame frameset hgroup image input type="datetime"isindex keygen listing marquee nextid noframes plaintext strike tt xmp

文字

itemid全局属性是某个项目的唯一全局标识符。itemid属性只能为既具有元素指定itemscope和itemtype属性。此外，itemid只能在具有itemscope相应属性的元素上指定itemtype或引用支持全局标识符的词汇表。

itemtype全局标识符的确切含义由指定词汇表中该标识符的定义提供。词汇表定义是否有多个具有相同全局标识符的项目可以共存，如果是，则处理具有相同标识符的项目。

注意： Whatwg.org 定义指定itemid必须是 URL 。但是，以下示例正确说明也可以使用 URN 。这种不一致可能反映了 Microdata 规范的不完整性。

例子

HTML

<dl itemscope
    itemtype="http://vocab.example.net/book"
    itemid="urn:isbn:0-330-34032-8"><dt>Title <dd itemprop="title">The Reality Dysfunction<dt>Author <dd itemprop="author">Peter F. Hamilton<dt>Publication date<dd><time itemprop="pubdate" datetime="1996-01-26">26 January 1996</time> </dl>

结构化数据

itemscope	itemtype: itemid	http://vocab.example.net/book: urn:isbn:0-330-34032-8
itemprop	title	The Reality Dysfunction
itemprop	author	Peter F. Hamilton
itemprop	pubdate	1996-01-26

结果

规范

Specification	Status	Comment
itemid		WG Note - No longer being actively developed

浏览器兼容性

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)

Feature	Android	Chrome for Android	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
Basic support	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)