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+++ b/editor/libeditor/tests/test_bug455992.html
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+<!DOCTYPE HTML>
+<html><head>
+<title>Test for bug 455992</title>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="/tests/SimpleTest/EventUtils.js"></script>
+
+<script class="testbody" type="application/javascript">
+function runTest() {
+  function select(id) {
+    var e = document.getElementById(id);
+    e.focus();
+    return e;
+  }
+
+  function setupIframe(id) {
+    var e = document.getElementById(id);
+    var doc = e.contentDocument;
+    doc.body.innerHTML = String.fromCharCode(10) + '<span id="' + id + '_span" style="border:1px solid blue" contenteditable="true">X</span>' + String.fromCharCode(10);
+    e = doc.getElementById(id + "_span");
+    e.focus();
+    return e;
+  }
+
+  function test_begin_bs(e) {
+    const msg = "BACKSPACE at beginning of contenteditable inline element";
+    var before = e.parentNode.childNodes[0].nodeValue;
+    sendKey("back_space");
+    is(e.parentNode.childNodes[0].nodeValue, before, msg + " with id=" + e.id);
+    is(e.innerHTML, "X", msg + " with id=" + e.id);
+  }
+
+  function test_begin_space(e) {
+    const msg = "SPACE at beginning of contenteditable inline element";
+    var before = e.parentNode.childNodes[0].nodeValue;
+    sendChar(" ");
+    is(e.parentNode.childNodes[0].nodeValue, before, msg + " with id=" + e.id);
+    is(e.innerHTML, "&nbsp;X", msg + " with id=" + e.id);
+  }
+
+  function test_end_delete(e) {
+    const msg = "DEL at end of contenteditable inline element";
+    var before = e.parentNode.childNodes[2].nodeValue;
+    sendKey("right");
+    sendKey("delete");
+    is(e.parentNode.childNodes[2].nodeValue, before, msg + " with id=" + e.id);
+    is(e.innerHTML, "X", msg + " with id=" + e.id);
+  }
+
+  function test_end_space(e) {
+    const msg = "SPACE at end of contenteditable inline element";
+    var before = e.parentNode.childNodes[2].nodeValue;
+    sendKey("right");
+    sendChar(" ");
+    is(e.parentNode.childNodes[2].nodeValue, before, msg + " with id=" + e.id);
+    is(
+      e.innerHTML,
+      SpecialPowers.getBoolPref("editor.white_space_normalization.blink_compatible") || e.tagName == "SPAN"
+        ? "X&nbsp;"
+        : "X <br>",
+      msg + " with id=" + e.id
+    );
+  }
+
+  test_begin_bs(select("t1"));
+  test_begin_space(select("t2"));
+  test_end_delete(select("t3"));
+  test_end_space(select("t4"));
+  test_end_space(select("t5"));
+
+  test_begin_bs(setupIframe("i1"));
+  test_begin_space(setupIframe("i2"));
+  test_end_delete(setupIframe("i3"));
+  test_end_space(setupIframe("i4"));
+
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(runTest);
+</script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=455992">Mozilla Bug 455992</a>
+<p id="display"></p>
+
+<pre id="test">
+</pre>
+
+<div> <span id="t1" style="border:1px solid blue" contenteditable="true">X</span> Y</div>
+<div> <span id="t2" style="border:1px solid blue" contenteditable="true">X</span> Y</div>
+<div> <span id="t3" style="border:1px solid blue" contenteditable="true">X</span> Y</div>
+<div> <span id="t4" style="border:1px solid blue" contenteditable="true">X</span> Y</div>
+<div> <div id="t5" style="border:1px solid blue" contenteditable="true">X</div> Y</div>
+
+<iframe id="i1" width="200" height="100" src="about:blank"></iframe><br>
+<iframe id="i2" width="200" height="100" src="about:blank"></iframe><br>
+<iframe id="i3" width="200" height="100" src="about:blank"></iframe><br>
+<iframe id="i4" width="200" height="100" src="about:blank"></iframe><br>
+
+</body>
+</html>