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chromium/content/test/data/interest_group/auction_only.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Page with subresource bundle auction-only signals</title>
<script type="webbundle">
{
  "source": "auction_only.wbn",
  "resources": ["/interest_group/auction_only_in_bundle.json"]
}
</script>