ladybird/Tests/LibWeb/Text/input/set-selection-inside-shadow-root.html

<script src="include.js"></script>
<div id="root"></div>
<script>
    function printSelectionDetails(selection) {
        println(`Selection range count: ${selection.rangeCount}`);
        if (selection.rangeCount > 0)
            println(`Selection start offset: ${selection.getRangeAt(0).startOffset}, end offset: ${selection.getRangeAt(0).endOffset}`);
    }

    test(() => {
        const rootElement = document.getElementById("root");
        const shadowRoot = rootElement.attachShadow({ mode: "open" });
        shadowRoot.innerHTML = "This is some text";
        const selection = window.getSelection();
        selection.setBaseAndExtent(shadowRoot, 0, shadowRoot, 1);
        println(`Selection range count: ${selection.rangeCount}`);
        println(`Selection start offset: ${selection.getRangeAt(0).startOffset}, end offset: ${selection.getRangeAt(0).endOffset}`);

        shadowRoot.innerHTML = "";
    });
</script>