y2

The y2 attribute is used to specify the second 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="5" y2="1" stroke="red"   />
  <line x1="1" x2="9" y1="5" y2="5" stroke="green" />
  <line x1="1" x2="9" y1="5" y2="9" stroke="blue"  />
</svg>

line

For <line>, y2 defines the y coordinate of the ending point of the line.

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

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

linearGradient

For <linearGradient>, y2 defines the y coordinate of the ending 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>
Default value	`0%`
Animatable	Yes

<svg viewBox="0 0 20 10" xmlns="http://www.w3.org/2000/svg">
  <!--
  By default the gradient vector end at the top right
  corner of the bounding box of the shape it is applied to.
  -->
  <linearGradient y2="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 end at the bottom right
  corner of the bounding box of the shape it is applied to.
  -->
  <linearGradient y2="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	Status	Comment
Scalable Vector Graphics (SVG) 2 The definition of 'y2' in that specification.	Candidate Recommendation	Definition for `<line>`
Scalable Vector Graphics (SVG) 2 The definition of 'y2' in that specification.	Candidate Recommendation	Definition for `<linearGradient>`
Scalable Vector Graphics (SVG) 1.1 (Second Edition) The definition of 'y2' in that specification.	Recommendation	Initial definition for `<line>`
Scalable Vector Graphics (SVG) 1.1 (Second Edition) The definition of 'y2' in that specification.	Recommendation	Initial definition for `<linearGradient>`

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https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/y2