HighlightRegistry: entries() method

Limited availability

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

The entries() method of the HighlightRegistry interface returns a new Iterator object that contains the [name, highlight] pairs for each element in the HighlightRegistry object, in insertion order.

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

Syntax

js
entries()

Return value

A new iterator object that contains an array of [name, highlight] for each Highlight object in the HighlightRegistry, in insertion order.

Examples

The code snippet below creates and registers two new highlights, and then logs the highlights and their names by using the iterator returned by the entries() method:

js
const myHighlight1 = new Highlight();
const myHighlight2 = new Highlight();

CSS.highlights.set("first-highlight", myHighlight1);
CSS.highlights.set("second-highlight", myHighlight2);

const iter = CSS.highlights.entries();

console.log(iter.next().value); // ['first-highlight', Highlight]
console.log(iter.next().value); // ['second-highlight', Highlight]

The following code example shows how to iterate over the highlights in the registry by using a for...of loop:

js
const myHighlight1 = new Highlight();
const myHighlight2 = new Highlight();

CSS.highlights.set("first-highlight", myHighlight1);
CSS.highlights.set("second-highlight", myHighlight2);

for (const [name, highlight] of CSS.highlights.entries()) {
  console.log(`Highlight ${name}`, highlight);
}

Specifications

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

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
entries

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