SVGAnimatedNumber: baseVal 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 baseVal property of the SVGAnimatedNumber interface represents the base (non-animated) value of an animatable numeric attribute.

Some animatable SVG attributes accept a single numeric value, such as the radius attribute of the <circle> or <ellipse> elements and the width and height attributes of the <rect> element, and many others. The baseVal property reflects and updates the base, or non-animated, value of the numeric attribute.

Value

A number; the base value of the attribute as a float.

Examples

This example includes a <path> element with a nested <animate> element that animates the value of the path's pathLength attribute:

html

<path d="M 0,40 h100" pathLength="90" id="path">
  <animate
    attributeName="pathLength"
    values="50; 90; 50;"
    dur="10s"
    repeatCount="indefinite" />
</path>

const path = document.querySelector("path");

console.log(path.pathLength.baseVal); // output: 90
path.pathLength.baseVal = 50; // updates the value
console.log(path.pathLength.baseVal); // output: 90

The baseVal reflect that value of the pathLength attribute. We also use the baseVal property to access the base (non-animating) value of the animating pathLength.

To access the current value of the pathLength value as it animates, use the SVGAnimatedNumber.animVal property.