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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>