内容表

• 范例
• 用法注意事项
• 规范
• 浏览器兼容性
• 另请参阅

marker-start

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>

marker-start attribute defines the arrowhead or polymarker that will be drawn at the first vertex of the given shape .

For all shape elements, except <polyline> and <path> , the last vertex is the same as the first vertex. In this case, if the value of marker-start and marker-end are both not none , then two markers will be rendered on that final vertex. For <path> elements, for each closed subpath, the last vertex is the same as the first vertex. marker-start is only rendered on the first vertex of the path data .

注意： As a presentation attribute, marker-start can be used as a CSS property.

You can use this attribute with the following SVG elements:

•   <circle>
• <ellipse>
• <line>
• <path>
• <polygon>
• <polyline>
• <rect>

范例

html, body, svg {
  height: 100%;
}

					

<svg viewBox="0 0 120 120" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <marker id="triangle" viewBox="0 0 10 10"
          refX="1" refY="5"
          markerUnits="strokeWidth"
          markerWidth="10" markerHeight="10"
          orient="auto">
      <path d="M 0 0 L 10 5 L 0 10 z" fill="#f00"/>
    </marker>
  </defs>
  <polyline fill="none" stroke="black"
      points="20,100 40,60 70,80 100,20" marker-start="url(#triangle)"/>
</svg>

					

用法注意事项

值	none | <marker-ref>
默认值	none
Animatable	discrete

none

Indicates that no marker symbol shall be drawn at the first vertex.

<marker-ref>

This value is a reference to a <marker> element, which will be drawn at the first vertex. If the reference is not valid, then no marker will be drawn.

规范

规范	状态	注释
Scalable Vector Graphics (SVG) 2 The definition of 'marker-start' in that specification.	候选推荐	No significant change
Scalable Vector Graphics (SVG) 1.1 (Second Edition) The definition of 'marker-start' in that specification.	推荐	初始定义

浏览器兼容性

BCD tables only load in the browser

另请参阅

• <marker>
• marker-end
• marker-mid

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最后修改： Sep 23, 2021 , 由 MDN 贡献者