chromium/third_party/blink/web_tests/external/wpt/css/css-pseudo/highlight-painting-003.html

<!doctype html>
<meta charset="utf-8">
<title>CSS Pseudo-Elements Test: highlight painting</title>
<link rel="author" name="Delan Azabani" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#highlight-painting">
<link rel="help" href="https://drafts.csswg.org/css-text-decor-4/#painting">
<link rel="help" href="https://www.w3.org/TR/CSS22/zindex.html#painting-order">
<link rel="match" href="highlight-painting-003-ref.html">
<meta name="assert" value="::selection overlay background and decorations are independent of those of the originating element, and originating element decorations lose their colour">
<script src="support/selections.js"></script>
<link rel="stylesheet" href="support/highlights.css">
<meta name="fuzzy" content="0-50;0-300">
<style>
    /*
        Topmost last:
        1.  originating background (grey)
        2.  unselected text (red)
        3.  originating line-through on unselected text (yellow)
        4.  ::selection background (green)
        5.  ::selection underline on selected text (blue)
        6.  selected text (purple)
        7.  originating line-through on selected text (purple!)

        Decoration paints are ordered by text-decoration-line
        (underline, overline, text, line-through), then by highlight
        overlay (originating, ::grammar-error, ::spelling-error,
        ::target-text, ::selection).
    */
    *, *::selection {
        text-decoration-skip-ink: none;
        text-decoration-skip: none;
    }
    main {
        font-size: 7em;
        margin: 0.5em;
        width: min-content;
        height: 0.25em;
        background: #707070C0;
        color: #E03838C0;
        text-decoration: #C0C000C0 solid line-through;
    }
    main::selection {
        background: #38E038C0;
        text-decoration: #3838E0C0 solid underline;
        color: #663399C0;
    }
</style>
<main class="highlight_reftest">quick</main>
<script>
    const target = document.querySelector("main");
    selectRangeWith(range => {
        range.selectNodeContents(target);
        range.setStart(target.childNodes[0], 0);
        range.setEnd(target.childNodes[0], 3);
    });
</script>