DOMMatrixReadOnly: isIdentity property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

Note: This feature is available in Web Workers.

The readonly isIdentity property of the DOMMatrixReadOnly interface is a Boolean whose value is true if the matrix is the identity matrix.

The identity matrix is one in which every value is 0 except those on the main diagonal from top-left to bottom-right corner (in other words, where the offsets in each direction are equal).

Value

A Boolean value.

Examples

js
// Initialize a 2D matrix
const matrix = new DOMMatrix(); // create a matrix
console.log(matrix.isIdentity); // output: true

// Apply a transform that has no effect
console.log(matrix.translate(0).isIdentity); // output: true

// Apply a transform with effect: this rotates the matrix by 30deg
console.log(matrix.rotate(30).isIdentity); // output: false

Specifications

Specification
Geometry Interfaces Module Level 1
# dom-dommatrixreadonly-isidentity

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
isIdentity

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

See also