text-shadow

Summary

text-shadow 为文字添加阴影。可以为文字与  text-decorations  添加多个阴影,阴影值之间用逗号隔开。

每个阴影指定相对文字的偏移量,可选的颜色及模糊半径。

多个阴影从前往后叠加,第一个阴影在最前面。

  • 初始值 none
  • 适用元素 all elements
  • 可继承 yes
  • 适用媒体 visual
  • 计算值 a color plus three absolute lengths
  • 可动画 yes, as a shadow list
  • Canonical order the unique non-ambiguous order defined by the formal grammar

Syntax

Formal grammar: none | [<shadow>,]* <shadow>

                where <shadow> is: [ <color>? <offset-x> <offset-y> <blur-radius>? | <offset-x> <offset-y> <blur-radius>? <color>? ]

Values

<color>
可选。位于偏移量前面或后面。如果没有指定颜色,则UA(用户代理)自行选择。
Note: 如果想让各浏览器保持一致,则应指定颜色
<offset-x> <offset-y>
必选。这些长度值指定阴影相对文字的偏移量。<offset-x> 指定水平偏移量,若是负值则阴影位于文字左边。 <offset-y> 指定垂直偏移量,若是负值则阴影位于文字上面。如果两者均为0,则阴影位于文字后面(如果设定了<blur-radius> 则会有模糊效果)。
单位查看 <length>
<blur-radius>
可选。这是 <length> 值。如果没有指定则为0。值越大,模糊半径越大,阴影也就越大越淡。

Examples

text-shadow: orange 0 -2px;

Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo.

text-shadow: 1px 1px 2px black, 0 0 1em blue, 0 0 0.2em blue;
color: white;
font: 1.5em Georgia, "Bitstream Charter", "URW Bookman L", "Century Schoolbook L", serif;

Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo.

text-shadow: rgba(0,0,0,0.1) -1px 0, rgba(0,0,0,0.1) 0 -1px,
             rgba(255,255,255,0.1) 1px 0, rgba(255,255,255,0.1) 0 1px,
             rgba(0,0,0,0.1) -1px -1px, rgba(255,255,255,0.1) 1px 1px; 
color: gold;
background: gold;

Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo.

Specifications

Specification Status Comment
CSS Transitions Working Draft Lists text-shadow as animatable.
CSS Text-decoration Level 3 Candidate Recommendation  

The CSS property text-shadow was improperly defined in CSS2 and dropped in CSS2 (Level 1). The CSS Text Module Level 3 spec improved and precised the syntax. Later it was moved to new working draft CSS Text Decoration Module Level 3.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 2.0.158.0 3.5 (1.9.1) 10 9.5 1.1 (100)
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support ? ? ? ? ?
  • Gecko (Firefox) theoretically supports infinite text-shadows (don't try it).
    Gecko 2 and later cap the blur radius at 300 for performance reasons.
    If the <color> value is unspecified, then Gecko uses the value of the element's color property.
  • Opera supports a maximum of 6-9 text-shadows for performance reasons. The blur radius is limited to 100px.
    Opera 9.5-10.1 adheres to the old, reverse painting order (CSS2, the first specified shadow is on the bottom).
  • Internet Explorer 5.5 supports Microsoft's Shadow and DropShadow Filter.
  • Safari: Any shadows that do not explicitly specify a color are transparent.
    Safari 1.1-3.2 only supports one text-shadow (displays the first shadow of a comma-separated list and ignores the rest).
    Safari 4.0 (WebKit 528) and later support multiple text-shadows.
  • Konqueror supports text-shadow starting with version 3.4.

See also

Document Tags and Contributors

Contributors to this page: yan
最后编辑者: yan,