			<div style="display:contents; width:100px; height:100px; background:red;">
					display: contents;
				</div>
			</div>
		</div>
		<hr />
		<h2 style="margin:0 0 1em; font:bold 16px monospace;">
			two-value syntax
		</h2>
		<div style="font:20px serif;">
			<span style="display:block flow; width:100px; height:100px; background:green;">
				display: block flow;
			</span>
			<span style="display:block flex; width:100px; height:100px; background:green;">
				display: block flex;
			</span>
			<span style=