        <div class="element-to-dock">
            <h1>Element to dock</h1>
        </div>
        <div class="test-template">
            <div>
                <button name="undock">Undock</button>
                <button name="dock-to" data-position="top" data-spacer="true">Dock to top</button>
                <button name="dock-to" data-position="topLeft" data-spacer="false">Dock to top left</button>
                <button name="dock-to" data-position="topRight" data-spacer="false">Dock to top right</but