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chromium/third_party/blink/web_tests/http/tests/inspector-protocol/resources/stylesheet-loading-issues.html 

<!DOCTYPE html>
<head>
  <!-- comment -->
  <link rel="stylesheet" href="404.css" />
  <link rel="stylesheet" href="stylesheet-loading-issues.css" />
  <style>
    @import url("406.css");
    div {
    }

    @import url("late.css");
  </style>
  <style> p {} @import url("late2.css");
  </style>
</head>