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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
characters

HTML<sub> 元素定義了一個(gè)文本區(qū)域,出于排版的原因,與主要的文本相比,應(yīng)該展示得更低并且更小。

內(nèi)容類別

Flow content and phrasing content

允許的內(nèi)容


Phrasing content

標(biāo)記遺漏

沒(méi)有,起始和結(jié)束標(biāo)簽都是強(qiáng)制性的。

允許的父母

任何可以包含  phrasing content 的元素

允許ARIA角色

任何

DOM接口


HTMLElement

屬性

這個(gè)元素僅僅包含全局屬性。

使用說(shuō)明

  • 這個(gè)元素應(yīng)該只用于排版目的,也就是改變文本的位置會(huì)改變含義,例如在數(shù)學(xué)中(t2,也可以考慮使用 MathML 公式)或者化學(xué)符號(hào)( H2O)。

  • 這個(gè)元素不能用于樣式上的目的,比如產(chǎn)品名稱 LaTeX 的樣式,這時(shí)應(yīng)該使用 CSS樣式: vertical-align 屬性的 sub 值能實(shí)現(xiàn)相同效果。

例子

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

結(jié)果

The chemical formula of water: H2O

規(guī)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


瀏覽器兼容性

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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