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chromium/third_party/blink/web_tests/fast/css/border-image-shorthand-initialize-longhands.html 

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>

<script>
test(function() {
  var div = document.createElement('div');
  div.setAttribute('style', 'border-image: round');
  assert_equals(div.style.borderImageRepeat, 'round');
  assert_equals(div.style.borderImageSlice, '100%');
  assert_equals(div.style.borderImage, 'none 100% / 1 / 0 round');

  div.setAttribute('style', 'border-image: url("https://example.com/") 1% 2% 3% 4% fill / 5px 6px 7px 8px / 9px 10px 11px 12px round space');
  assert_equals(div.style.borderImageRepeat, 'round space');
  assert_equals(div.style.borderImageSlice, '1% 2% 3% 4% fill');
  assert_equals(div.style.borderImage, 'url(\"https://example.com/\") 1% 2% 3% 4% fill / 5px 6px 7px 8px / 9px 10px 11px 12px round space');
}, 'Ensure border-image shorthand property initializes longhand properties such as border-image-repeat and border-image-slice');
</script>