ladybird/Tests/LibWeb/Text/input/Editing/execCommand-insertLinebreak.html

<script src="../include.js"></script>
<div id="a" contenteditable>foobar</div>
<div id="b" contenteditable><p style="white-space: pre">foobar</p></div>
<div id="c" contenteditable><p style="white-space: pre">foobar</p></div>
<script>
    test(() => {
        let divA = document.querySelector('div#a');
        let divB = document.querySelector('div#b');
        let divC = document.querySelector('div#c');

        document.body.offsetWidth // Force a layout

        // A: Insert linebreak after 'foo'
        println(`Before: "${divA.innerHTML}"`);
        var range = document.createRange();
        range.setStart(divA.firstChild, 3);
        getSelection().addRange(range);
        document.execCommand('insertLinebreak');
        println(`After: "${divA.innerHTML}"`);
        getSelection().empty();

        // B: Insert linebreak after 'foo'
        println(`Before: "${divB.innerHTML}"`);
        var range = document.createRange();
        range.setStart(divB.firstChild.firstChild, 3);
        getSelection().addRange(range);
        document.execCommand('insertLinebreak');
        println(`After: "${divB.innerHTML}"`);
        getSelection().empty();

        // C: Insert linebreak after 'bar'
        println(`Before: "${divC.innerHTML}"`);
        var range = document.createRange();
        range.setStart(divC.firstChild.firstChild, 6);
        getSelection().addRange(range);
        document.execCommand('insertLinebreak');
        println(`After: "${divC.innerHTML}"`);
        getSelection().empty();
    });
</script>