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• 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

width CSS descriptor is shorthand for setting both the min-width 和 max-width descriptors of the viewport. By providing one viewport length value, that value will determine both the min-width 和 max-width to the value provided.

If two viewport values are provided the first value will be set to the min-width and the second value will be set max-width .

句法

/* An example with one viewport value: */
@viewport {
    width: 320px;
}
/* An example with two viewport values: */
@viewport {
    width: 320px, 120px;
}
					

值

auto

The used value is calculated from the other CSS descriptors' values.

<length>

A non-negative absolute or relative length.

<percentage>

A percentage value relative to the width or height of the initial viewport at zoom factor 1.0, for horizontal and vertical lengths respectively. Must be non-negative.

形式定义

相关 at-rule	@viewport
初始值	as each of the properties of the shorthand: min-width : auto max-width : none
百分比	as each of the properties of the shorthand: min-width : refer to the width of the containing block max-width : refer to the width of the containing block
计算值	as each of the properties of the shorthand: min-width : the percentage as specified or the absolute length max-width : the percentage as specified or the absolute length or none

形式句法

<viewport-length>{1,2}
where 
<viewport-length> = auto | <length-percentage>
where 
<length-percentage> = <length> | <percentage>
					

范例

Setting minimum and maximum width

@viewport {
  width: 500px;
}
					

规范

规范	状态	注释
CSS Device Adaptation The definition of '"min-width" descriptor' in that specification.	工作草案	初始定义

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
width descriptor	Chrome 不支持 29 — 84	Edge 完整支持 12 Prefixed 完整支持 12 Prefixed Prefixed Implemented with the vendor prefix: -ms-	Firefox 不支持 No	IE 完整支持 10 Prefixed 完整支持 10 Prefixed Prefixed Implemented with the vendor prefix: -ms-	Opera 完整支持 16 完整支持 16 不支持 11.1 — 15	Safari 不支持 No	WebView Android 不支持 4.4 — 37	Chrome Android 不支持 29 — 84	Firefox Android 不支持 No	Opera Android 完整支持 16 完整支持 16 不支持 11.1 — 14	Safari iOS 不支持 No	Samsung Internet Android 完整支持 2.0

图例

完整支持

完整支持

不支持

不支持

要求使用供应商前缀或不同名称。

要求使用供应商前缀或不同名称。

另请参阅

• @viewport

元数据

• 最后修改： Jul 22, 2020

相关话题

1. CSS
2. CSS 参考
3. CSS Device Adaptation
4. At-Rules

   1. @viewport