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+<!DOCTYPE html>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1581337
+-->
+<head>
+ <title>Test for Bug 1581337</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>
+ <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1581337">Mozilla Bug 1581337</a>
+ <p id="display"></p>
+
+ <div id="editor" contenteditable><span _moz_quote="true">foo bar</span></div>
+</body>
+<script>
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(() => {
+ let editor = document.getElementById("editor");
+ editor.focus();
+ let selection = document.getSelection();
+ selection.collapse(editor.firstChild.firstChild, 4);
+ synthesizeKey("KEY_Backspace");
+ // FYI: `_moz_quote` attribute is ignored at serializing HTML content.
+ is(editor.innerHTML, "<span>foobar</span>", "Backspace should delete the previous whitespace");
+ synthesizeKey("KEY_Delete");
+ is(editor.innerHTML, "<span>fooar</span>", "Delete should delete the next character, \"b\"");
+ SimpleTest.finish();
+});
+</script>
+</html>