<!DOCTYPE html>
<html>
<head>
</head>
<body>
This test makes sure repaint rects are correct for thick underlines. The test passes if you don't see anything below.
<div id="target" style="font: 48px 'Times'; text-decoration: underline; text-decoration-thickness: 100px;">Hello</div>
<script>
if (window.testRunner)
    testRunner.waitUntilDone();
window.setTimeout(function() {
    let target = document.getElementById("target");
    target.parentElement.removeChild(target);
    if (window.testRunner)
        testRunner.notifyDone();
}, 20);
</script>
</body>
</html>