LayoutTests/fast/shadow-dom/slot-remove-mutate-add.html - WebKit - Git at Google

 <body>
 <div id="d"><div></div></div>
 <script>
 const shadow = d.attachShadow({mode:"open"});
 shadow.innerHTML = `<slot></slot>`;
 d.offsetWidth;
 shadow.innerHTML = ``;
 d.innerHTML = "foo";
 shadow.innerHTML = `<slot></slot>`;
 </script>
	<body>
	<div id="d"><div></div></div>
	<script>
	const shadow = d.attachShadow({mode:"open"});
	shadow.innerHTML = `<slot></slot>`;
	d.offsetWidth;
	shadow.innerHTML = ``;
	d.innerHTML = "foo";
	shadow.innerHTML = `<slot></slot>`;
	</script>