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---
title: <thead>
slug: Web/HTML/Element/thead
tags:
- 元素
- 表格
translation_of: Web/HTML/Element/thead
---
<p><strong>HTML</strong>的<strong><thead></strong>元素定义了一组定义表格的列头的行。</p>
<p>{{EmbedInteractiveExample("pages/tabbed/thead.html","tabbed-taller")}}</p>
<table class="properties">
<tbody>
<tr>
<th scope="row"><a href="/en-US/docs/HTML/Content_categories">内容类别</a></th>
<td>无。</td>
</tr>
<tr>
<th scope="row">允许内容</th>
<td>零或多个{{ HTMLElement("tr") }}元素。</td>
</tr>
<tr>
<th scope="row">标签省略</th>
<td>开头的标签是强制的。如果{{ HTMLElement("thead") }} 元素后直接跟 {{ HTMLElement("tbody") }}或{{ HTMLElement("tfoot") }}元素，结尾的标签可以被省略。</td>
</tr>
<tr>
<th scope="row">Permitted parents</th>
<td>A {{ HTMLElement("table") }} element. The {{ HTMLElement("thead") }} must appear after any {{ HTMLElement("caption") }} or {{ HTMLElement("colgroup") }} element, even implicitly defined, but before any {{ HTMLElement("tbody") }}, {{ HTMLElement("tfoot") }} and {{ HTMLElement("tr") }} element.</td>
</tr>
<tr>
<th scope="row">Permitted ARIA roles</th>
<td>Any</td>
</tr>
<tr>
<th scope="row">DOM interface</th>
<td>{{domxref("HTMLTableSectionElement")}}</td>
</tr>
</tbody>
</table>
<h2 id="属性">属性</h2>
<p>This element includes the <a href="/en-US/docs/Web/HTML/Global_attributes">global attributes</a>.</p>
<dl>
<dt>{{ htmlattrdef("align") }} {{ Deprecated_inline() }} in {{ HTMLVersionInline("4") }}, {{ obsolete_inline() }} in {{ HTMLVersionInline("5") }}</dt>
<dd>This enumerated attribute specifies how horizontal alignment of each cell content will be handled. Possible values are:
<ul>
<li><code>left</code>, aligning the content to the left of the cell</li>
<li><code>center</code>, centering the content in the cell</li>
<li><code>right</code>, aligning the content to the right of the cell</li>
<li><code>justify</code>, inserting spaces into the textual content so that the content is justified in the cell</li>
<li><code>char</code>, aligning the textual content on a special character with a minimal offset, defined by the {{ htmlattrxref("char", "thead") }} and {{ htmlattrxref("charoff", "thead") }} attributes {{ unimplemented_inline("2212") }}.</li>
</ul>
<p>If this attribute is not set, the <code>left</code> value is assumed.</p>
<div class="note"><strong>Note: </strong>Do not use this attribute as it is obsolete (not supported) in the latest standard.
<ul>
<li>To achieve the same effect as the <code>left</code>, <code>center</code>, <code>right</code> or <code>justify</code> values, use the CSS {{ cssxref("text-align") }} property on it.</li>
<li>To achieve the same effect as the <code>char</code> value, in CSS3, you can use the value of the {{ htmlattrxref("char", "thead") }} as the value of the {{ cssxref("text-align") }} property {{ unimplemented_inline() }}.</li>
</ul>
</div>
</dd>
</dl>
<dl>
<dt>{{ htmlattrdef("bgcolor") }} {{ Non-standard_inline() }}</dt>
<dd>This attribute defines the background color of each cell of the column. It is one of the 6-digit hexadecimal code as defined in <a class="external" href="https://www.w3.org/Graphics/Color/sRGB">sRGB</a>, prefixed by a '#'. One of the sixteen predefined color strings may be used:
<table style="width: 80%;">
<tbody>
<tr>
<td style="background-color: black; width: 24px; height: 24px; border-width: 1px; border-color: black; border-style: solid;"></td>
<td><code>black</code> = "#000000"</td>
<td style="background-color: green; width: 24px; height: 24px; border-width: 1px; border-color: black; border-style: solid;"></td>
<td><code>green</code> = "#008000"</td>
</tr>
<tr>
<td style="background-color: silver; width: 24px; height: 24px; border-width: 1px; border-color: black; border-style: solid;"></td>
<td><code>silver</code> = "#C0C0C0"</td>
<td style="background-color: lime; width: 24px; height: 24px; border-width: 1px; border-color: black; border-style: solid;"></td>
<td><code>lime</code> = "#00FF00"</td>
</tr>
<tr>
<td style="background-color: gray; width: 24px; height: 24px; border-width: 1px; border-color: black; border-style: solid;"></td>
<td><code>gray</code> = "#808080"</td>
<td style="background-color: olive; width: 24px; height: 24px; border-width: 1px; border-color: black; border-style: solid;"></td>
<td><code>olive</code> = "#808000"</td>
</tr>
<tr>
<td style="background-color: white; width: 24px; height: 24px; border-width: 1px; border-color: black; border-style: solid;"></td>
<td><code>white</code> = "#FFFFFF"</td>
<td style="background-color: yellow; width: 24px; height: 24px; border-width: 1px; border-color: black; border-style: solid;"></td>
<td><code>yellow</code> = "#FFFF00"</td>
</tr>
<tr>
<td style="background-color: maroon; width: 24px; height: 24px; border-width: 1px; border-color: black; border-style: solid;"></td>
<td><code>maroon</code> = "#800000"</td>
<td style="background-color: navy; width: 24px; height: 24px; border-width: 1px; border-color: black; border-style: solid;"></td>
<td><code>navy</code> = "#000080"</td>
</tr>
<tr>
<td style="background-color: red; width: 24px; height: 24px; border-width: 1px; border-color: black; border-style: solid;"></td>
<td><code>red</code> = "#FF0000"</td>
<td style="background-color: blue; width: 24px; height: 24px; border-width: 1px; border-color: black; border-style: solid;"></td>
<td><code>blue</code> = "#0000FF"</td>
</tr>
<tr>
<td style="background-color: purple; width: 24px; height: 24px; border-width: 1px; border-color: black; border-style: solid;"></td>
<td><code>purple</code> = "#800080"</td>
<td style="background-color: teal; width: 24px; height: 24px; border-width: 1px; border-color: black; border-style: solid;"></td>
<td><code>teal</code> = "#008080"</td>
</tr>
<tr>
<td style="background-color: fuchsia; width: 24px; height: 24px; border-width: 1px; border-color: black; border-style: solid;"></td>
<td><code>fuchsia</code> = "#FF00FF"</td>
<td style="background-color: aqua; width: 24px; height: 24px; border-width: 1px; border-color: black; border-style: solid;"></td>
<td><code>aqua</code> = "#00FFFF"</td>
</tr>
</tbody>
</table>
<div class="note"><strong>Usage note: </strong>Do not use this attribute, as it is non-standard and only implemented in some versions of Microsoft Internet Explorer: the {{ HTMLElement("thead") }} element should be styled using <a href="/en-US/docs/CSS">CSS</a>. To give a similar effect to the <strong>bgcolor</strong> attribute, use the <a href="/en-US/docs/CSS">CSS</a> property {{ cssxref("background-color") }}, on the relevant {{ HTMLElement("td") }} or {{ HTMLElement("th") }} elements.</div>
</dd>
</dl>
<dl>
<dt>{{ htmlattrdef("char") }} {{ Deprecated_inline() }} in {{ HTMLVersionInline("4") }}, {{ obsolete_inline() }} in {{ HTMLVersionInline("5") }}</dt>
<dd>This attribute is used to set the character to align the cells in a column on. Typical values for this include a period (.) when attempting to align numbers or monetary values. If {{ htmlattrxref("align", "tr") }} is not set to <code>char</code>, this attribute is ignored.
<div class="note"><strong>Note: </strong>Do not use this attribute as it is obsolete (and not supported) in the latest standard. To achieve the same effect as the {{ htmlattrxref("char", "thead") }}, in CSS3, you can use the character set using the {{ htmlattrxref("char", "thead") }} attribute as the value of the {{ cssxref("text-align") }} property {{ unimplemented_inline() }}.</div>
</dd>
</dl>
<dl>
<dt>{{ htmlattrdef("charoff") }} {{ Deprecated_inline() }} in {{ HTMLVersionInline("4") }}, {{ obsolete_inline() }} in {{ HTMLVersionInline("5") }}</dt>
<dd>This attribute is used to indicate the number of characters to offset the column data from the alignment characters specified by the <strong>char</strong> attribute.
<div class="note"><strong>Note: </strong>Do not use this attribute as it is obsolete (and not supported) in the latest standard.</div>
</dd>
</dl>
<dl>
<dt>{{ htmlattrdef("valign") }} {{ Deprecated_inline() }} in {{ HTMLVersionInline("4") }}, {{ obsolete_inline() }} in {{ HTMLVersionInline("5") }}</dt>
<dd>This attribute specifies the vertical alignment of the text within each row of cells of the table header. Possible values for this attribute are:
<ul>
<li><code>baseline</code>, which will put the text as close to the bottom of the cell as it is possible, but align it on the <a class="external" href="https://en.wikipedia.org/wiki/Baseline_%28typography%29">baseline</a> of the characters instead of the bottom of them. If characters are all of the size, this has the same effect as <code>bottom</code>.</li>
<li><code>bottom</code>, which will put the text as close to the bottom of the cell as it is possible;</li>
<li><code>middle</code>, which will center the text in the cell;</li>
<li><code>top</code>, which will put the text as close to the top of the cell as it is possible.</li>
</ul>
<div class="note"><strong>Note: </strong>Do not use this attribute as it is obsolete (and not supported) in the latest standard: instead set the CSS {{ cssxref("vertical-align") }} property on it.</div>
</dd>
</dl>
<h2 id="示例">示例</h2>
<p>See {{ HTMLElement("table") }} for examples on<code> <thead></code>.</p>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
<tr>
<td>{{SpecName('HTML WHATWG','tables.html#the-thead-element','thead element')}}</td>
<td>{{Spec2('HTML WHATWG')}}</td>
<td></td>
</tr>
<tr>
<td>{{SpecName('HTML5 W3C','tabular-data.html#the-thead-element','thead element')}}</td>
<td>{{Spec2('HTML5 W3C')}}</td>
<td></td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<div>
<p>{{Compat("html.elements.thead")}}</p>
</div>
<h2 id="参见">参见</h2>
<ul>
<li>Other table-related HTML Elements: {{ HTMLElement("caption") }}, {{ HTMLElement("col") }}, {{ HTMLElement("colgroup") }}, {{ HTMLElement("table") }}, {{ HTMLElement("tbody") }}, {{ HTMLElement("td") }}, {{ HTMLElement("tfoot") }}, {{ HTMLElement("th") }}, {{ HTMLElement("tr") }};</li>
<li>CSS properties and pseudo-classes that may be specially useful to style the <code><thead></code> element:
<ul>
<li>the {{ cssxref(":nth-child") }} pseudo-class to set the alignment on the cells of the column;</li>
<li>the {{ cssxref("text-align") }} property to align all cells content on the same character, like '.'.<</li>
</ul>
</li>
</ul>
<p>{{HTMLRef}}</p>
|
