A practical guide to using the CSS Custom Highlight API and the `::highlight()` pseudo-element for custom text highlighting. The tutorial walks through the four steps needed: creating `Highlight()` instances, registering them in `CSS.highlights`, creating `Range()` objects for text fragments, and styling with `::highlight()`. Crucially, it demonstrates a progressive enhancement approach using `<mark>` elements as a fallback for when JavaScript is unavailable or the browser lacks support, wrapping `::highlight()` styles in a `@supports` block.
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