:focus

CSS伪类 :focus表示获得焦点的元素（如表单输入）。当用户点击或触摸元素或通过键盘的 “tab” 键选择它时会被触发。

/* Selects any <input> when focused */
input:focus {
  color: red;
}

提示：此伪类仅适用于焦点元素本身。如果要选择包含焦点元素的元素，请使用:focus-within 。

语法

:focus

Example

HTML

<input class="red-input" value="I'll be red when focused."><br>
<input class="blue-input" value="I'll be blue when focused.">

CSS

.red-input:focus {
  background: yellow;
  color: red;
}

.blue-input:focus {
  background: yellow;
  color: blue;
}

结果

规范

Specification Status Comment
HTML Living Standard
:focus		 Living Standard Defines HTML-specific semantics.
Selectors Level 4
:focus		 Working Draft No change.
Selectors Level 3
:focus		 Recommendation No change.
CSS Level 2 (Revision 1)
:focus		 Recommendation Initial definition.

浏览器兼容性

BCD tables only load in the browser

 

参考