Custom Highlight API

The Custom Highlight API extends the concept of highlight pseudo-elements by providing a way for web developers to style the text of arbitrary Range objects, rather than being limited to the user agent defined ::selection, ::inactive-selection, ::spelling-error, and ::grammar-error. This is useful in a variety of scenarios, including editing frameworks that wish to implement their own selection, find-on-page over virtualized documents, multiple selection to represent online collaboration, or spellchecking frameworks.

Read the specification for more details.


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The Custom Highlight API relies on the ::highlight(name) pseudo-element, which can be used to assigned highlighting styles to custom highlighted ranges created with the CSS.highlights JavaScript API.

Demo source code