css/cssom/CSSFontFaceRule.html

<!doctype html>
<meta charset="utf-8">
<title>CSSOM -  CSSFontFaceRule interface</title>
<link rel="help" href="https://drafts.csswg.org/css-fonts-4/#cssfontfacerule">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  @font-face {
    src: local("foo");
    font-family: foo;
    font-weight: bold;
  }
</style>
<script>
test(function() {
  // TODO: The exact serialization isn't consistent across browsers
  // (Firefox doesn't preserve ordering of the descriptors, WebKit/Blink does).
  let rule = document.styleSheets[0].cssRules[0];
  assert_false(rule.cssText.includes('\n'));
}, "CSSFontFaceRule.cssText doesn't serialize with newlines");
</script>