<!DOCTYPE html>
<html>
<head>
<script>
    (() => {
        addEventListener("input", () => { });
        addEventListener("DOMContentLoaded", () => {
            let editor = document.getElementById("editor");
            function render() {
                mutationObserver.disconnect();
                editor.innerHTML = editor.innerHTML;
                getSelection().collapse(editor.firstElementChild, 1);
                mutationObserver.observe(editor, {
                    childList: true,
                    attributes: true,
                    characterData: true,
                    subtree: true
                });
            }

            var mutationObserver = new MutationObserver(render);
            editor.focus();
            render();

            function typeNewlines(remaining) {
                if (!eventSender)
                    return;

                eventSender.keyDown("\n", []);
                if (remaining == 0)
                    testRunner.notifyDone();
                else {
                    setTimeout(() => {
                        typeNewlines(remaining - 1);
                    }, 100);
                }
            }

            typeNewlines(3);
        });
    })();
</script>
</head>
<body>
<div id="editor" contenteditable><div><br></div></div>
<div>To manually test this, press enter multiple times in the editable area. Newlines should be inserted.</div>
</body>
<script>
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
</script>
</html>