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y1

The y1 attribute is used to specify the first y-coordinate for drawing an SVG element that requires more than one coordinate. Elements that only need one coordinate use the y attribute instead.

You can use this attribute with the following SVG elements:

Example

<svg viewBox="0 0 10 10" xmlns="http://www.w3.org/2000/svg">
  <line x1="1" x2="9" y1="1" y2="5" stroke="red" />
  <line x1="1" x2="9" y1="5" y2="5" stroke="green" />
  <line x1="1" x2="9" y1="9" y2="5" stroke="blue" />
</svg>

line

For <line>, y1 defines the y coordinate of the starting point of the line.

Value	<length> \| <percentage> \| <number>
Default value	`0`
Animatable	Yes

<svg viewBox="0 0 10 10" xmlns="http://www.w3.org/2000/svg">
  <line x1="1" x2="9" y1="1" y2="5" stroke="red" />
  <line x1="1" x2="9" y1="5" y2="5" stroke="green" />
  <line x1="1" x2="9" y1="9" y2="5" stroke="blue" />
</svg>

linearGradient

For <linearGradient>, y1 defines the y coordinate of the starting point of the gradient vector used to map the gradient stop values. The exact behavior of this attribute is influenced by the gradientUnits attributes

Value	<length> \| <percentage> \| <number>
Default value	`0%`
Animatable	Yes

<svg viewBox="0 0 20 10" xmlns="http://www.w3.org/2000/svg">
  <!--
  By default the gradient vector start at the top left
  corner of the bounding box of the shape it is applied to.
  -->
  <linearGradient y1="0%" id="g0">
    <stop offset="5%" stop-color="black" />
    <stop offset="50%" stop-color="red" />
    <stop offset="95%" stop-color="black" />
  </linearGradient>

  <rect x="1" y="1" width="8" height="8" fill="url(#g0)" />

  <!--
  Here the gradient vector start at the bottom left
  corner of the bounding box of the shape it is applied to.
  -->
  <linearGradient y1="100%" id="g1">
    <stop offset="5%" stop-color="black" />
    <stop offset="50%" stop-color="red" />
    <stop offset="95%" stop-color="black" />
  </linearGradient>

  <rect x="11" y="1" width="8" height="8" fill="url(#g1)" />
</svg>

Specifications

Specification
Scalable Vector Graphics (SVG) 2 # LineElementY1Attribute
Scalable Vector Graphics (SVG) 2 # LinearGradientElementY1Attribute

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https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/y1