在此页

• 句法
• 形式定义
• 形式句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

overflow-block CSS property sets what shows when content overflows the block start and block end edges of a box. This may be nothing, a scroll bar, or the overflow content.

overflow-block property maps to overflow-y or overflow-x depending on the writing mode of the document.

句法

/* Keyword values */
overflow-block: visible;
overflow-block: hidden;
overflow-block: scroll;
overflow-block: auto;
/* Global values */
overflow-block: inherit;
overflow-block: initial;
overflow-block: unset;
					

overflow-block property is specified as a single keyword chosen from the list of values below.

值

visible

Content is not clipped and may be rendered outside the padding box's block start and block end edges.

hidden

Content is clipped if necessary to fit the block dimension in the padding box. No scrollbars are provided.

scroll

Content is clipped if necessary to fit in the block dimension in the padding box. Browsers display scrollbars whether or not any content is actually clipped. (This prevents scrollbars from appearing or disappearing when the content changes.) Printers may still print overflowing content.

auto

Depends on the user agent. If content fits inside the padding box, it looks the same as visible , but still establishes a new block-formatting context. Desktop browsers provide scrollbars if content overflows.

形式定义

初始值	auto
适用于	Block-containers, flex containers, and grid containers
继承	no
计算值	as specified, except with visible / clip computing to auto / hidden respectively if one of overflow-x or overflow-y is neither visible nor clip
动画类型	discrete

形式句法

visible | hidden | clip | scroll | auto
					

范例

HTML

<ul>
  <li><code>overflow-block:hidden</code> — hides the text outside the box
  <div id="div1">
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
    </div>
  </li>
  <li><code>overflow-block:scroll</code> — always adds a scrollbar
  <div id="div2">
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
    </div>
  </li>
  <li><code>overflow-block:visible</code> — displays the text outside the box if needed
  <div id="div3">
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
    </div>
  </li>
  <li><code>overflow-block:auto</code> — on most browser, equivalent to <code>scroll</code>
  <div id="div4">
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
    </div>
  </li>
</ul>
					

CSS

#div1,
#div2,
#div3,
#div4 {
  border: 1px solid black;
  width:  250px;
  height: 100px;
}
#div1 { overflow-block: hidden; margin-bottom: 120px;}
#div2 { overflow-block: scroll; margin-bottom: 120px;}
#div3 { overflow-block: visible; margin-bottom: 120px;}
#div4 { overflow-block: auto; margin-bottom: 120px;}
					

结果

规范

规范	状态	注释
CSS Overflow Module Level 3 The definition of 'overflow-block' in that specification.	工作草案

初始值	auto
适用于	Block-containers, flex containers, and grid containers
继承	no
计算值	as specified, except with visible / clip computing to auto / hidden respectively if one of overflow-x or overflow-y is neither visible nor clip
动画类型	discrete

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
overflow-block	Chrome 不支持 No	Edge 不支持 No	Firefox 完整支持 69	IE 不支持 No	Opera 不支持 No	Safari 不支持 No	WebView Android 不支持 No	Chrome Android 不支持 No	Firefox Android 不支持 No	Opera Android 不支持 No	Safari iOS 不支持 No	Samsung Internet Android 不支持 No

图例

完整支持

完整支持

不支持

不支持

另请参阅

• Related CSS properties: text-overflow , white-space , overflow , overflow-inline , overflow-x , overflow-y , clip , display
• CSS Logical Properties
• Writing Modes

元数据

• 最后修改： Jul 30, 2020

相关话题

1. CSS
2. CSS 参考
3. CSS Overflow
4. 特性

   1. -webkit-line-clamp
   2. overflow
   3. overflow-block
   4. overflow-inline
   5. overflow-x
   6. overflow-y