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chromium/third_party/blink/web_tests/external/wpt/css/css-conditional/container-queries/crashtests/chrome-custom-highlight-crash.html 

<!DOCTYPE html>
<title>Empty ::highlight styles inside @container causes crash</title>
<link rel="help" href="https://crbug.com/1486352">
<style>
  @container (width) {
    section::highlight(custom-highlight) {
      --foo: bar;
    }
  }
</style>
<section style="container-type:inline-size"></section>