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chromium/third_party/blink/web_tests/fast/css/important-js-override.html 

<!DOCTYPE html>
<div id="element"></div>

<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>
test(function () {
  element.style.cssText = '';

  element.style.setProperty('color', 'red');
  assert_equals(element.style.getPropertyValue('color'), 'red');
  assert_equals(element.style.getPropertyPriority('color'), '');

  element.style.setProperty('color', 'green');
  assert_equals(element.style.getPropertyValue('color'), 'green');
  assert_equals(element.style.getPropertyPriority('color'), '');
}, "Check that a non-important inline style can be replaced by a non-important one with setProperty()");

test(function () {
  element.style.cssText = '';

  element.style.color = 'red';
  assert_equals(element.style.getPropertyValue('color'), 'red');
  assert_equals(element.style.getPropertyPriority('color'), '');

  element.style.color = 'green';
  assert_equals(element.style.getPropertyValue('color'), 'green');
  assert_equals(element.style.getPropertyPriority('color'), '');
}, "Check that a non-important inline style can be replaced by a non-important one without setProperty()");

test(function () {
  element.style.cssText = '';

  element.style.setProperty('color', 'red');
  assert_equals(element.style.getPropertyValue('color'), 'red');
  assert_equals(element.style.getPropertyPriority('color'), '');

  element.style.setProperty('color', 'green', 'important');
  assert_equals(element.style.getPropertyValue('color'), 'green');
  assert_equals(element.style.getPropertyPriority('color'), 'important');
}, "Check that a non-important inline style can be replaced by an important one with setProperty()");

test(function () {
  element.style.cssText = '';

  element.style.setProperty('color', 'red', 'important');
  assert_equals(element.style.getPropertyValue('color'), 'red');
  assert_equals(element.style.getPropertyPriority('color'), 'important');

  element.style.setProperty('color', 'green');
  assert_equals(element.style.getPropertyValue('color'), 'green');
  assert_equals(element.style.getPropertyPriority('color'), '');
}, "Check that a important inline style can be replaced by a non-important one with setProperty()");

test(function () {
  element.style.cssText = '';

  element.style.setProperty('color', 'red', 'important');
  assert_equals(element.style.getPropertyValue('color'), 'red');
  assert_equals(element.style.getPropertyPriority('color'), 'important');

  element.style.color = 'green';
  assert_equals(element.style.getPropertyValue('color'), 'green');
  assert_equals(element.style.getPropertyPriority('color'), '');
}, "Check that a important inline style can be replaced by a non-important one without setProperty()");

test(function () {
  element.style.cssText = '';

  element.style.setProperty('color', 'red', 'important');
  assert_equals(element.style.getPropertyValue('color'), 'red');
  assert_equals(element.style.getPropertyPriority('color'), 'important');

  element.style.setProperty('color', 'green', 'important');
  assert_equals(element.style.getPropertyValue('color'), 'green');
  assert_equals(element.style.getPropertyPriority('color'), 'important');
}, "Check that an important inline style can be replaced by an important one with setProperty()");
</script>