HighlightRegistry: size property
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 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® 2026 Language Specification # sec-get-map.prototype.size |