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Test Info:

<!DOCTYPE html>
<!--
-->
<html>
<head>
<title>Test for Bug 1619852</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" style="display: none"></div>
<pre id="test"></pre>
<div contenteditable>abcd</div>
<script>
SimpleTest.waitForExplicitFinish();
SimpleTest.waitForFocus(() => {
let editor = document.querySelector("div[contenteditable]");
// Do nothing, but `HTMLEditor` may use different path to detect unexpected DOM tree or selection change.
editor.addEventListener("DOMNodeRemoved", () => {});
getSelection().collapse(editor.firstChild, 4);
synthesizeKey("KEY_Backspace");
is(editor.textContent, "abc", "The last character should've been removed by the Backspace");
getSelection().collapse(editor.firstChild, 1);
synthesizeKey("KEY_Backspace");
is(editor.textContent, "bc", "The first character should've been removed by the Backspace");
SimpleTest.finish();
});
</script>
</body>
</html>