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chromium/third_party/blink/web_tests/fast/forms/accent-color/range-accent-color-press-appearance.html 

<!DOCTYPE html>
<meta name=fuzzy content="maxDifference=0-3; totalPixels=0-100">
<script src="../../../resources/run-after-layout-and-paint.js"></script>
<script src="../resources/common.js"></script>

<body style="accent-color: rgb(193, 62, 190)">

not pressed:<br>
<input type=range><br>
<br>

pressed:<br>
<input type=range id=hovered><br>

<script>
pressElement(document.getElementById('hovered'));
</script>