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Test Info:

<!DOCTYPE html>
<html>
<head>
<title>CSS Scoping Module Level 1 - ::before and ::after pseudo class' contents on a node assigned to a slot element must be rendered</title>
<link rel="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org"/>
<link rel="match" href="reference/green-box.html"/>
</head>
<body>
<style>
my-host {
display: block;
width: 100px;
height: 100px;
background: red;
}
div {
display: block;
background: red;
line-height: 0px;
width: 100%;
height: 50px;
}
[slot=foo]::before,
[slot=foo]::after {
display: block;
content: "";
width: 100%;
height: 25px;
}
[slot=foo]::before,
[slot=foo]::after {
background: green;
}
[slot=bar]::before,
[slot=bar]::after {
background: yellow;
}
</style>
<p>Test passes if you see a single 100px by 100px green box below.</p>
<my-host>
<div slot="foo"></div>
<div slot="bar"></div>
<div slot="foo"></div>
</my-host>
<script>
try {
var shadowHost = document.querySelector('my-host');
shadowRoot = shadowHost.attachShadow({mode: 'open'});
shadowRoot.innerHTML = '<slot name="foo"></slot>';
} catch (exception) {
document.body.appendChild(document.createTextNode(exception));
}
</script>
</body>
</html>