内容表

• 范例
• 属性
• 用法注意事项
• 规范
• 浏览器兼容性

<feDropShadow>

1. SVG 元素

   1. A
      1. <a>
      2. <altGlyph>
      3. <altGlyphDef>
      4. <altGlyphItem>
      5. <animate>
      6. <animateColor>
      7. <animateMotion>
      8. <animateTransform>
   2. B-C
      1. <circle>
      2. <clipPath>
      3. <color-profile>
      4. <cursor>
   3. D
      1. <defs>
      2. <desc>
   4. E
      1. <ellipse>
   5. F
      1. <feBlend>
      2. <feColorMatrix>
      3. <feComponentTransfer>
      4. <feComposite>
      5. <feConvolveMatrix>
      6. <feDiffuseLighting>
      7. <feDisplacementMap>
      8. <feDistantLight>
      9. <feFlood>
      10. <feFuncA>
      11. <feFuncB>
      12. <feFuncG>
      13. <feFuncR>
      14. <feGaussianBlur>
      15. <feImage>
      16. <feMerge>
      17. <feMergeNode>
      18. <feMorphology>
      19. <feOffset>
      20. <fePointLight>
      21. <feSpecularLighting>
      22. <feSpotLight>
      23. <feTile>
      24. <feTurbulence>
      25. <filter>
      26. <font>
      27. <font-face>
      28. <font-face-format>
      29. <font-face-name>
      30. <font-face-src>
      31. <font-face-uri>
      32. <foreignObject>
   6. G
      1. <g>
      2. <glyph>
      3. <glyphRef>
   7. H
      1. <hkern>
   8. I
      1. <image>
   9. J-L
      1. <line>
      2. <linearGradient>
   10. M
       1. <marker>
       2. <mask>
       3. <metadata>
       4. <missing-glyph>
       5. <mpath>
   11. N-P
       1. <path>
       2. <pattern>
       3. <polygon>
       4. <polyline>
   12. Q-R
       1. <radialGradient>
       2. <rect>
   13. S
       1. <script>
       2. <set>
       3. <stop>
       4. <style>
       5. <svg>
       6. <switch>
       7. <symbol>
   14. T
       1. <text>
       2. <textPath>
       3. <title>
       4. <tref>
       5. <tspan>
   15. U
       1. <use>
   16. V-Z
       1. <view>
       2. <vkern>

The SVG <feDropShadow> filter primitive creates a drop shadow of the input image. It can only be used inside a <filter> 元素。

注意： The drop shadow color and opacity can be changed by using the flood-color and flood-opacity presentation attributes.

范例

html,body,svg { height:100% }

					

<svg viewBox="0 0 30 10" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <filter id="shadow">
      <feDropShadow dx="0.2" dy="0.4" stdDeviation="0.2"/>
    </filter>
    <filter id="shadow2">
      <feDropShadow dx="0" dy="0" stdDeviation="0.5"
          flood-color="cyan"/>
    </filter>
    <filter id="shadow3">
      <feDropShadow dx="-0.8" dy="-0.8" stdDeviation="0"
          flood-color="pink" flood-opacity="0.5"/>
    </filter>
  </defs>
  <circle cx="5" cy="50%" r="4"
      style="fill:pink; filter:url(#shadow);"/>
  <circle cx="15" cy="50%" r="4"
      style="fill:pink; filter:url(#shadow2);"/>
  <circle cx="25" cy="50%" r="4"
      style="fill:pink; filter:url(#shadow3);"/>
</svg>

					

属性

dx

This attribute defines the x offset of the drop shadow. Value type : <number> ; 默认值 : 2 ; Animatable : yes

dy

This attribute defines the y offset of the drop shadow. Value type : <number> ; 默认值 : 2 ; Animatable : yes

stdDeviation

This attribute defines the standard deviation for the blur operation in the drop shadow. Value type : <number> ; 默认值 : 2 ; Animatable : yes

全局属性

Core Attributes

Most notably: id

Styling Attributes

class , style

Filter primitive attributes

height , in , result , x , y , width

Presentation Attributes

Most notably: flood-color , flood-opacity

用法注意事项

类别	Filter primitive element
准许内容	Any number of the following elements, in any order: <animate> , <script> , <set>

规范

规范
Filter Effects Module Level 2 (Filter Effects 2) # feDropShadowElement

浏览器兼容性

BCD tables only load in the browser

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最后修改： Sep 23, 2021 , 由 MDN 贡献者