LayoutTests/highlight/highlight-renderer-created-inside-range.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Custom Highlight API: content inside a highlight range that becomes rendered after the range has been painted is highlighted</title>
<style id="toggle">
#inner {
    display: none;
}
</style>
<style>
#target {
    font: 16px/20px monospace;
    white-space: pre;
    width: max-content;
    color: black;
}
#target::highlight(test),
#inner::highlight(test) {
    background-color: lime;
}
</style>
<script src="../resources/ui-helper.js"></script>
</head>
<body>
<p>PASS if the bar below is one solid lime rectangle with no gap in the middle.</p>
<div id="target">AAAA<span id="inner">AAAA</span>AAAA</div>
<script>
if (window.testRunner)
    testRunner.waitUntilDone();

(async () => {
    const target = document.getElementById("target");
    const range = new Range();
    range.setStart(target, 0);
    range.setEnd(target, target.childNodes.length);
    CSS.highlights.set("test", new Highlight(range));

    await UIHelper.renderingUpdate();

    // Editing the style sheet gives #inner a renderer without changing the DOM or the range.
    document.getElementById("toggle").sheet.cssRules[0].style.display = "inline";

    if (window.testRunner)
        testRunner.notifyDone();
})();
</script>
</body>
</html>