HighlightRegistry: size property

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

The size property returns the number of Highlight objects in the HighlightRegistry.

Value

A read-only integer indicating how many Highlight objects the registry contains.

Examples

Using size

js
const highlight1 = new Highlight();
const highlight2 = new Highlight();

CSS.highlights.set("highlight-1", highlight1);
CSS.highlights.set("highlight-2", highlight2);

console.log(CSS.highlights.size); // 2

Specifications

Specification
ECMAScript® 2025 Language Specification
# sec-get-map.prototype.size

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
size

Legend

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

Full support
Full support
In development. Supported in a pre-release version.
In development. Supported in a pre-release version.
No support
No support
See implementation notes.

See also