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Test Info:

<!DOCTYPE html>
<html>
<head>
<title>CSS counter order and scope with Shadow DOM and SLOT</title>
<link rel="author" title="Martin Robinson" href="mailto:mrobinson@igalia.com">
<link rel="match" href="counter-slot-order-ref.html">
<style>
.counted {
counter-increment: section;
}
.counted::before {
content: "C=" counter(section) " ";
}
</style>
</head>
<body>
<div id="host">
<div class="counted" slot="content3">Three</div>
<div class="counted" slot="content2">Two</div>
<div class="counted" slot="content1">One</div>
</div>
<script>
const shadowRoot = document
.getElementById('host')
.attachShadow({mode: 'open'});
shadowRoot.innerHTML = `
<div>
<slot name="content1"></slot>
<slot name="content2"></slot>
<slot name="content3"></slot>
</div>
`;
</script>
</body>
</html>