File: test_bug1407085.html

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<!DOCTYPE HTML>
<html>
<head>
  <title>Test for Bug 1407085</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <script src="/tests/SimpleTest/EventUtils.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<p id="display"></p>

<div id="content">
  <input id="input" value="original value">
</div>

<pre id="test">
<script class="testbody" type="text/javascript">

SimpleTest.waitForExplicitFinish();
SimpleTest.waitForFocus(runTests);

function runTests() {
  let input = document.getElementById("input");
  input.focus();
  input.addEventListener("keydown", () => {
    input.value = "new value";
  }, { once: true });
  synthesizeKey("KEY_Escape");
  is(input.value, "new value",
     "New <input> value changed by an Escape key event listener shouldn't be " +
     "overwritten by original value even if Escape key is pressed");
  SimpleTest.finish();
}

</script>
</pre>
</body>
</html>