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chromium/third_party/blink/web_tests/fast/forms/color/color-picker-events-nochange.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='color1' value='#000000' oninput='inputEventCount++;' onchange='changeEventCount++;'>
<script>
'use strict';

var inputEventCount = 0;
var changeEventCount = 0;

promise_test(() => {
  let colorControl = document.getElementById('color1');
  return openPicker(colorControl)
  .then(() => {
    internals.pagePopupWindow.focus();
    eventSender.keyDown('Enter');
    assert_equals(inputEventCount, 0, 'No input event should have fired if color value was not changed.');
    return new Promise((resolve) => {
      window.setTimeout(() => {
        assert_equals(changeEventCount, 0, 'No change event should have fired if color value was not changed.');
        resolve();
      }, 0)
    });
  });
}, "Color picker: Opening and closing popup with no changes should not fire input/change events");

</script>