margin-block-start

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
Percentages	depends on layout model
适用媒体	visual
计算值	if specified as a length, the corresponding absolute length; if specified as a percentage, the specified value; otherwise, `auto`
Animation type	discrete
正规顺序	the unique non-ambiguous order defined by the formal grammar

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

	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
`margin-block-start` Experimental	Chrome Full support 69	Edge No support No	Firefox 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 No	Opera Full support 56	Safari Full support 12.1	WebView Android Full support 69	Chrome Android Full support 69	Firefox 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 48	Safari iOS Full support 12.2	Samsung Internet Android No support No

Legend

Full support: Full support
No support: No support
Experimental. Expect behavior to change in the future.: Experimental. Expect behavior to change in the future.
User must explicitly enable this feature.: User must explicitly enable this feature.

同样推荐

标记的物理属性: margin-top, margin-right, margin-bottom, and margin-left
writing-mode, direction, text-orientation

最后修改： Aug 12, 2019, by MDN contributors