defs

<defs>

SVG允许定义图形对象以备后用。建议尽可能在元素内部定义引用的<defs>元素。在<defs>元素中定义这些元素可以提高SVG内容的可理解性，从而提高可访问性。元素中定义的图形元素<defs>不会被直接渲染。您可以使用<use>元素在视口中的任何位置呈现这些元素。

用法上下文

分类	集装箱元素，结构元素
允许的内容	任意数量的下列元素，以任何顺序排列：动画元素描述元素图形元素结构元素渐变元素<a>, <altGlyphDef>, <clipPath>, <color-profile>, <cursor>, <filter>, <font>, <font-face>, <foreignObject>, <image>, <marker>, <mask>, <pattern>, <script>, <style>, <switch>, <text>, <view>

属性

全局属性

Conditional processing attributes

Core attributes

Graphical event attributes

Presentation attributes

class

style

externalResourcesRequired

transform

具体属性

没有

DOM接口

这个元素实现了SVGDefsElement接口。

例

<svg width="80px" height="30px" viewBox="0 0 80 30"
     xmlns="http://www.w3.org/2000/svg">

  <defs>
    <linearGradient id="Gradient01">
      <stop offset="20%" stop-color="#39F" />
      <stop offset="90%" stop-color="#F3F" />
    </linearGradient>
  </defs>

  <rect x="10" y="10" width="60" height="10" 
        fill="url(#Gradient01)" />
</svg>

产品规格

Specification	Status	Comment
Scalable Vector Graphics (SVG) 2The definition of '<defs>' in that specification.	Candidate Recommendation	No change
Scalable Vector Graphics (SVG) 1.1 (Second Edition)The definition of '<defs>' in that specification.	Recommendation	Initial definition

浏览器兼容性

Feature	Chrome	Edge	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support	1.0	(Yes)	1.5 (1.8)	9.0	8.0	3.0.4

Feature	Android	Edge	Firefox Mobile (Gecko)	IE Phone	Opera Mobile	Safari Mobile
Basic support	3.0	(Yes)	1.0 (1.8)	No support	(Yes)	3.0.4