html#z-index" />
        <meta name="flags" content="may" />
        <meta name="assert" content="The 'z-index' property can apply to elements with a display of 'table-header-group'." />
        <style type="text/css">* { margin: 0; padding: 0 }
            #test
            {
                background: green;
                display: table-header-group;
                z-index: 1;
            }
            #table
            {
                display: table;
                table-layout: fixe