x1

The x1 attribute is used to specify the first x-coordinate for drawing an SVG element that requires more than one coordinate. Elements that only need one coordinate use the x 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="5" y1="1" y2="9" stroke="red" />
  <line x1="5" x2="5" y1="1" y2="9" stroke="green" />
  <line x1="9" x2="5" y1="1" y2="9" stroke="blue" />
</svg>

line

For <line>, x1 defines the x coordinate of the starting 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="5" y1="1" y2="9" stroke="red"   />
  <line x1="5" x2="5" y1="1" y2="9" stroke="green" />
  <line x1="9" x2="5" y1="1" y2="9" stroke="blue"  />
</svg>

linearGradient

For <linearGradient>, x1 defines the x 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>
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 left
  bounding limit of the shape it is applied to
  -->
  <linearGradient x1="0%" id="g0">
    <stop offset="0"    stop-color="black"  />
    <stop offset="100%" stop-color="red" />
  </linearGradient>

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

  <!--
  Here the gradient vector start at 80% of the left
  bounding limit of the shape it is applied to
  -->
  <linearGradient x1="80%" id="g1">
    <stop offset="0"    stop-color="black"  />
    <stop offset="100%" stop-color="red" />
  </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 'x1' in that specification.	Candidate Recommendation	Definition for `<line>`
Scalable Vector Graphics (SVG) 2 The definition of 'x1' in that specification.	Candidate Recommendation	Definition for `<linearGradient>`
Scalable Vector Graphics (SVG) 1.1 (Second Edition) The definition of 'x1' in that specification.	Recommendation	Initial definition for `<line>`
Scalable Vector Graphics (SVG) 1.1 (Second Edition) The definition of 'x1' in that specification.	Recommendation	Initial definition for `<linearGradient>`

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https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/x1