::cue (:cue)

:: cue CSS伪元素匹配所选元素中的WebVTT提示。这可以用于在VTT轨道的媒体中使用字幕和其他线索。

只有CSS一小部分属性可以与 :: cue 伪元素一起使用：

color
opacity
visibility
text-decoration and its longhand properties: text-decoration-line, text-decoration-color, and text-decoration-style
text-shadow
background and its longhand properties: background-color, background-clip, background-image, background-origin, background-position, background-repeat, background-size, background-attachment, and background-blend-mode
outline and its longhand properties: outline-color, outline-style, outline-width
font and its longhand properties: font-kerning, font-style, font-variant, font-variant-numeric, font-variant-position, font-variant-east-asian (en-US), font-variant-caps, font-variant-alternates, font-variant-ligatures, font-synthesis, font-feature-settings, font-language-override, font-weight, font-size, font-size-adjust, font-stretch, and font-family
line-height
white-space
text-combine-upright (en-US)
ruby-position (en-US)

属性应用于整个提示集，就像它们是单个单元一样。唯一的例外是背景及其简写属性可以单独应用于每个提示，以避免创建框并遮盖意外大面积的媒体。

`语法`


::cue | ::cue( <selector> )

`示例`

以下CSS设置提示样式，使文本为白色，背景为半透明黑盒。


::cue {
  color: #fff;
  background-color: rgba(0, 0, 0, 0.6);
}

`规范`

`规范`	`状态`	`注解`
`WebVTT: The Web Video Text Tracks Format`	`Candidate Recommendation`	`Initial definition`

The compatibility table in 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.

`参考`

网络视频轨道格式（WebVTT