CSSMatrixComponent-DOMMatrix-mutable.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSSMatrixComponent's matrix attribute is mutable</title>
<meta name="author" title="Shane Stephens">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
  <div id="log"></div>
  <script>
    test(function() {
      var component = new CSSMatrixComponent(new DOMMatrix());
      assert_equals(component.matrix.m11, 1, 'DOMMatrix expected to be initialized to identity');
      component.matrix.m11 = 2;
      assert_equals(component.matrix.m11, 2, 'modification of m11 component of DOMMatrix expected to succeed');
    });
  </script>

chromium/third_party/blink/web_tests/external/wpt/css/css-typed-om/CSSMatrixComponent-DOMMatrix-mutable.html