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Test Info:

<!DOCTYPE html>
<html>
<!--
-->
<head>
<title>Test for Bug 850043</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=850043">Mozilla Bug 850043</a>
<div id="display">
<textarea id="textarea">b&#x9080;&#xe010f;&#x8fba;&#xe0101;</textarea>
<div contenteditable id="edit">b&#x9080;&#xe010f;&#x8fba;&#xe0101;</div>
</div>
<div id="content" style="display: none">
</div>
<pre id="test">
</pre>
<script>
SimpleTest.waitForExplicitFinish();
SimpleTest.waitForFocus(() => {
let fm = SpecialPowers.Services.focus;
let element = document.getElementById("textarea");
element.setSelectionRange(element.value.length, element.value.length);
element.focus();
is(SpecialPowers.unwrap(fm.focusedElement), element, "failed to move focus");
synthesizeKey("KEY_End");
sendString("a");
is(element.value, "b\u{9080}\u{e010f}\u{8fba}\u{e0101}a", "a isn't last character");
synthesizeKey("KEY_Backspace", {repeat: 3});
is(element.value, "b", "cannot remove all IVS characters");
element = document.getElementById("edit");
element.focus();
is(SpecialPowers.unwrap(fm.focusedElement), element, "failed to move focus");
let sel = window.getSelection();
sel.collapse(element.childNodes[0], element.textContent.length);
sendString("a");
is(element.textContent, "b\u{9080}\u{e010f}\u{8fba}\u{e0101}a", "a isn't last character");
synthesizeKey("KEY_Backspace", {repeat: 3});
is(element.textContent, "b", "cannot remove all IVS characters");
SimpleTest.finish();
});
</script>
</body>
</html>