firefox/testing/web-platform/tests/css/compositing/root-element-background-margin-opacity-ref.html

<!DOCTYPE html>
<div style="position: absolute; top: 100px; left: 100px; width: 100px; height: 100px;
            background: green; opacity: 0.5"></div>
	`<!DOCTYPE html>`
	`<div style="position: absolute; top: 100px; left: 100px; width: 100px; height: 100px;`
	`background: green; opacity: 0.5"></div>`