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chromium/third_party/blink/web_tests/external/wpt/css/css-cascade/scope-declaration-list-crash.html 

<!DOCTYPE html>
<title>@scope crash with invalid selectors</title>
<style>
  @scope (div) {
    z-index: 1;
  }
  @scope (div) {
    .a;
  }
</style>
<p>
  PASS if no crash.
</p>