jellyfin-web/dashboard-ui/edititemmetadata.html

<div id="editItemMetadataPage" data-role="page" class="page libraryPage metadataEditorPage noSecondaryNavPage" data-contextname="${HeaderMetadataManager}" data-require="scripts/editorsidebar,scripts/edititemmetadata">
    <div class="editPageSidebar" style="overflow:auto;">
        <div class="libraryTree">
            <ul></ul>
        </div>
    </div>
    <div data-role="content">
        <div class="editPageInnerContent">
        </div>
    </div>
</div>