最大宽度 | @viewport.max-width
@viewport.max-width
max-widthCSS描述符指定通过定义的文档的视口的最大宽度@viewportat-rule。
默认情况下，在考虑最大宽度约束的情况下，宽度将尽可能接近初始视图。
| Related at-rule | @viewport |
|---|---|
| 初始值 | auto |
| Percentages | refer to the width of the initial viewport |
| 适用媒体 | visual, continuous |
| 计算值 | if specified as a length, the corresponding absolute length; if specified as a percentage, the specified value; otherwise, auto |
| 正规顺序 | the unique non-ambiguous order defined by the formal grammar |
语法
/* Keyword value */
max-width: auto;
max-width: none;
/* <length> values */
max-width: 600px;
max-width: 80em;
max-width: 15cm;
/* <percentage> value */
max-width: 75%;
值
auto使用的值是从其他CSS描述符的值中计算出来的。无使用的值是从其他CSS描述符的值中计算出来的。<length>非负的绝对或相对长度。<percentage>相对于初始视口宽度的百分比值，对于水平长度，缩放系数为1.0。必须是非负的。
正式语法
<viewport-length>where
<viewport-length> = auto | <length-percentage>
where
<length-percentage> = <length> | <percentage>
规范
| Specification | Status | Comment |
|---|---|---|
| CSS Device AdaptationThe definition of '"max-width" descriptor' in that specification. | Working Draft | Initial definition |
浏览器兼容性
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 29 (behind a flag) | No support | 10 -ms | 11.10 Removed in 15 Reintroduced behind a flag in 16 | No support |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | 4.4 | 29 | No support | 10-ms | 11.10 Removed in 15 Reintroduced behind a flag in 16 | No support |
