css/css-ui/webkit-appearance-serialization.html

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Serialization of `-webkit-appearance`</title>
  <link rel="help" href="https://drafts.csswg.org/css-ui-4/#appearance-switching">
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script>
test(function() {
  var input = document.createElement('input');
  input.style.setProperty('-webkit-appearance', 'none');

  assert_equals(input.style.cssText, 'appearance: none;');
}, 'serialization via CSSStyleDeclaration');

test(function(t) {
  var style = document.createElement('style');
  document.body.appendChild(style);
  t.add_cleanup(function() {
    document.body.removeChild(style);
  });
  style.sheet.insertRule('#foo {}', 0);
  style.sheet.cssRules[0].style.setProperty('-webkit-appearance', 'none');

  assert_equals(
    style.sheet.cssRules[0].cssText, '#foo { appearance: none; }'
  );
}, 'serialization via CSSStyleRule');

test(function(t) {
  var style = document.createElement('style');
  document.body.appendChild(style);
  t.add_cleanup(function() {
    document.body.removeChild(style);
  });
  style.sheet.insertRule('@media print { #foo {} }', 0);
  style.sheet.cssRules[0].cssRules[0].style.setProperty('-webkit-appearance', 'none');

  assert_equals(
    style.sheet.cssRules[0].cssText,
    '@media print {\n  #foo { appearance: none; }\n}'
  );
}, 'serialization via CSSMediaRule');
</script>
</body>