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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
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HTML<sub> 元素定义了一个文本区域,出于排版的原因,与主要的文本相比,应该展示得更低并且更小。

内容类别

Flow content and phrasing content

允许的内容


Phrasing content

标记遗漏

没有,起始和结束标签都是强制性的。

允许的父母

任何可以包含  phrasing content 的元素

允许ARIA角色

任何

DOM接口


HTMLElement

属性

这个元素仅仅包含全局属性。

使用说明

  • 这个元素应该只用于排版目的,也就是改变文本的位置会改变含义,例如在数学中(t2,也可以考虑使用 MathML 公式)或者化学符号( H2O)。

  • 这个元素不能用于样式上的目的,比如产品名称 LaTeX 的样式,这时应该使用 CSS样式: vertical-align 属性的 sub 值能实现相同效果。

例子

<p>The chemical formula of water: H<sub>2</sub>O</p>

结果

The chemical formula of water: H2O

规范

Specification

Status

Comment

HTML Living StandardThe definition of '<sub> and <sup>' in that specification.

Living Standard


HTML5The definition of '<sub> and <sup>;' in that specification.

Recommendation


浏览器兼容性

Feature

Chrome

Edge

Firefox

Internet Explorer

Opera

Safari

Basic Support

(Yes)

(Yes)

1

(Yes)

(Yes)

(Yes)

Feature

Android

Chrome for Android

Edge mobile

Firefox for Android

IE mobile

Opera Android

iOS Safari

Basic Support

(Yes)

(Yes)

(Yes)

1

(Yes)

(Yes)

(Yes)

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