ladybird/Tests/LibWeb/Text/input/Editing/move-cursor-using-selection-api.html

<script src="../include.js"></script>
<div id="text" contenteditable="true">heo</div>
<script>
    test(() => {
        let text = document.getElementById("text");
        text.focus();
        document.getSelection().collapse(text.firstChild, 2);
        internals.sendText(text, "lll");
        println(text.textContent);
    });
</script>