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chromium/third_party/blink/web_tests/fast/forms/color/color-picker-no-tab-character.html 

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

<input type='color' id='color' value='#80d9ff'>
<script>
'use strict';

let t = async_test('Color picker: Tabbing into a color value container should not insert a tab character.');
t.step(() => {
  let colorControl = document.getElementById('color');
  openPicker(colorControl)
  .then(t.step_func_done(() => {
    internals.pagePopupWindow.focus();
    const popupDocument = internals.pagePopupWindow.document;
    const rValueContainer = popupDocument.getElementById('rValueContainer');
    const gValueContainer = popupDocument.getElementById('gValueContainer');
    const bValueContainer = popupDocument.getElementById('bValueContainer');
    assert_equals(rValueContainer.value, '128');
    assert_equals(gValueContainer.value, '217');
    assert_equals(bValueContainer.value, '255');
    const hueSliderSelectionRing = popupDocument.querySelector('hue-slider > color-selection-ring');
    hueSliderSelectionRing.focus();

    [rValueContainer, gValueContainer, bValueContainer].forEach(container => {
      container.addEventListener('keypress', t.step_func(event => {
        assert_not_equals(event.key, 'Tab',
          'If tab key suppression was successful, there should be no keypress event for it.');
      }));
    });

    assert_equals(popupDocument.activeElement, hueSliderSelectionRing);
    eventSender.keyDown('Tab');
    assert_equals(popupDocument.activeElement, rValueContainer, 'rValueContainer should be the active element');
    assert_equals(rValueContainer.value, '128', 'rValueContainer\'s value should not have changed');
    eventSender.keyDown('Tab');
    assert_equals(popupDocument.activeElement, gValueContainer, 'gValueContainer should be the active element');
    assert_equals(gValueContainer.value, '217', 'gValueContainer\'s value should not have changed');
    eventSender.keyDown('Tab');
    assert_equals(popupDocument.activeElement, bValueContainer, 'bValueContainer should be the active element');
    assert_equals(bValueContainer.value, '255', 'bValueContainer\'s value should not have changed');
  }));
});
</script>