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Test Info:

<!DOCTYPE html>
<!-- saved from url=(0065)https://bug1134545.bugzilla.mozilla.org/attachment.cgi?id=8566418 -->
<html><head><meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<script>
function onLoad() {
// For emulating the traditional behavior, collapse Selection to end of the
// text at end of the <body>.
getSelection().collapse(
document.body.lastChild,
document.body.lastChild.length
);
const textNode = document.createTextNode(" ");
const editingHost = document.querySelector("div[contenteditable]");
editingHost.appendChild(textNode);
editingHost.setAttribute('contenteditable', "true");
textNode.remove();
getSelection().selectAllChildren(textNode);
document.execCommand("increasefontsize");
}
</script>
</head>
<body onload="onLoad();">
<div contenteditable></div>
</body></html>