LayoutTests/editing/selection/editable-html-element.html

<html contenteditable="true" id="test">
<script>
if (window.testRunner)
     testRunner.dumpEditingCallbacks();
</script>
<script>
function runTest() {
    var s = window.getSelection();
    var e = document.getElementById("test");

    e.focus();
    document.execCommand("InsertText", false, "\t");
    document.execCommand("InsertText", false, "This tests to see where the selection is set when an html element is focused.");
    document.execCommand("InsertHTML", false, "<br>We set it inside the body because we don't want to allow editing outside the body.<br>This test also does some editing to make sure it happens in the body.");

    document.querySelectorAll('script').forEach((script) => script.remove());
}
onload = runTest;
</script>
<script src="../../resources/dump-as-markup.js"></script>
<body>
</body>
</html>