HighlightRegistry: has() method

Limited availability

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

The has() method of the HighlightRegistry interface returns a boolean indicating whether or not a Highlight object with the specified name exists in the registry.

HighlightRegistry is a Map-like object, so this is similar to using Map.has().

Syntax

js
has(name)

Parameters

name

The name of the Highlight object to test for presence in the registry.

Return value

Returns true if a highlight with the specified name exists in the registry; otherwise false.

Examples

js
const fooHighlight = new Highlight();
CSS.highlights.set("foo", fooHighlight);

myHighlight.has("foo"); // true
myHighlight.has("bar"); // false

Specifications

Specification
ECMAScript® 2025 Language Specification
# sec-map.prototype.has

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
has

Legend

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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