File: test_key_enter_prevent_default.html

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<!DOCTYPE html>
<html>
<head>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <script src="/tests/SimpleTest/EventUtils.js"></script>
  <script>
  SimpleTest.waitForExplicitFinish();
  function runTest() {
    const summary = document.querySelector("summary");
    summary.addEventListener('click', function(e) {
      // Prevent the details from toggling by key events.
      e.preventDefault();
    });
    // Dispatch 'return' key to the summary element.
    summary.focus();
    synthesizeKey("KEY_Enter");

    const details = document.querySelector("details");
    ok(!details.open, "Prevent default on summary should not open details.");

    SimpleTest.finish();
  }
  </script>
</head>
<body onload="runTest();">
  <details>
    <summary>Summary</summary>
    <p>This is the details.</p>
  </details>
</body>
</html>