The delete() method of the HighlightRegistry interface removes a the named Highlight object from the HighlightRegistry.

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

customHighlightName

The name, as a String, of the Highlight object to remove from the HighlightRegistry.

Returns true if a Highlight object under the provided name was in the HighlightRegistry; otherwise false.

The following code sample registers a highlight in the registry, and then deletes it:

const myHighlight = new Highlight(range1, range2);

CSS.highlights.set("my-highlight", myHighlight);

CSS.highlights.delete("foo"); // false
CSS.highlights.delete("my-highlight"); // true

• The CSS Custom Highlight API
• CSS Custom Highlight API: The Future of Highlighting Text Ranges on the Web