color-picker-appearance-tap-hex-format.html

<!DOCTYPE html>
<meta name=fuzzy content="maxDifference=0-3; totalPixels=0-1000">
<script src="../../../resources/testdriver.js"></script>
<script src="../../../resources/testdriver-vendor.js"></script>
<script src="../resources/picker-common.js"></script>

<input type='color' value='#7EFFC9'>

<script>
  window.onload = openPickerAppearanceOnly(document.querySelector('input'),() => {
    internals.pagePopupWindow.focus();
    const popupDocument = internals.pagePopupWindow.document;
    const formatToggler = popupDocument.querySelector('format-toggler');
    const formatTogglerRect = formatToggler.getBoundingClientRect();
    // // first tap changes format to HSL
    eventSender.gestureTap(formatTogglerRect.left + formatTogglerRect.width / 3, formatTogglerRect.top + formatTogglerRect.height / 3);
    // second tap changes format to Hex
    eventSender.gestureTap(formatTogglerRect.left + formatTogglerRect.width / 2, formatTogglerRect.top + formatTogglerRect.height / 2);
  });
</script>

chromium/third_party/blink/web_tests/fast/forms/color/color-picker-appearance-tap-hex-format.html