HighlightRegistry: has() method
Baseline 2025Newly available
Since June 2025, this feature works across the latest devices and browser versions. This feature might not work in older devices or 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
Highlightobject 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® 2026 Language Specification # sec-map.prototype.has |