margin-block-start

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这是一个实验中的功能
此功能某些浏览器尚在开发中，请参考浏览器兼容性表格以得到在不同浏览器中适合使用的前缀。由于该功能对应的标准文档可能被重新修订，所以在未来版本的浏览器中该功能的语法和行为可能随之改变。

margin-block-start CSS 属性定义了一个元素的逻辑块的开始边距, 是用来根据元素的书写模式，方向和文本方向进行实际边界的衡量。

/* <length> values */
margin-block-start: 10px;  /* 绝对长度 */
margin-block-start: 1em;   /* 文本的相对大小 */
margin-block-start: 5%;    /* 相对于最近块容器的大小 */

/* 关键字值 */
margin-block-start: auto;

/* 全局值 */
margin-block-start: inherit;
margin-block-start: initial;
margin-block-start: unset

margin-top, margin-right, margin-bottom, or margin-left 属性对应于 writing-mode, direction, 和text-orientation属性定义的值.

它涉及到 margin-block-end, margin-inline-start,和 margin-inline-end属性, 这些属性是用来定义其它元素的边界。

初始值0
适用元素same as margin
是否是继承属性否
Percentagesdepends on layout model
计算值if specified as a length, the corresponding absolute length; if specified as a percentage, the specified value; otherwise, auto
Animation typea length

Syntax

Values

margin-block-start 属性有着和 margin-left 属性一样的值.

Formal syntax

<'margin-left'>

案例

HTML Content

<div>
  <p class="exampleText">Example text</p>
</div>

CSS Content

div {
  background-color: yellow;
  width: 120px;
  height: 120px;
}

.exampleText {
  writing-mode: vertical-lr;
  margin-block-start: 20px;
  background-color: #c8c800;
}

Specification

Specification Status Comment
CSS Logical Properties and Values Level 1
margin-block-start		 Editor's Draft 初始定义

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
margin-block-startChrome Full support 69Edge Full support 79Firefox Full support 41
Full support 41
No support 38 — 51
Disabled
Disabled From version 38 until version 51 (exclusive): this feature is behind the layout.css.vertical-text.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
IE No support NoOpera Full support 56Safari Full support 12.1WebView Android Full support 69Chrome Android Full support 69Firefox Android Full support 41
Full support 41
No support 38 — 51
Disabled
Disabled From version 38 until version 51 (exclusive): this feature is behind the layout.css.vertical-text.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android Full support 48Safari iOS Full support 12.2Samsung Internet Android Full support 10.0

Legend

Full support  
Full support
No support  
No support
User must explicitly enable this feature.
User must explicitly enable this feature.

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