SVGLineElement: x1 property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨July 2015⁩.

The x1 read-only property of the SVGLineElement interface describes the start of the SVG line along the x-axis as an SVGAnimatedLength. It reflects the <line> element's x1 geometric attribute.

The attribute value is a <length>, <percentage>, or <number>. The numeric value of the SVGAnimatedLength.baseVal is that start position as a length along the x-axis in user coordinate system units.

Value

An SVGAnimatedLength.

Example

Given the following SVG:

html

<svg viewBox="0 0 300 200" xmlns="http://www.w3.org/2000/svg">
  <line x1="20" y1="30" x2="40" y2="50" stroke="blue" stroke-width="2" />
  <line x1="15%" y1="0" x2="30%" y2="60" stroke="red" stroke-width="4" />
</svg>

We can access the computed values of the x1 attributes:

const lines = document.querySelectorAll("line");
const x1Pos0 = lines[0].x1;
const x1Pos1 = lines[1].x1;
console.dir(x1Pos0.baseVal.value); // output: 20 (the value of `x1`)
console.dir(x1Pos1.baseVal.value); // output: 45 (15% of 300)