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chromium/third_party/blink/web_tests/external/wpt/css/css-counter-styles/counter-style-at-rule/additive-symbols-syntax.html 

<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-counter-styles-3/#counter-style-symbols">
<link rel="author" href="mailto:[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/counter-style-testcommon.js"></script>
<script>
function test_valid_additive_symbols(value, expected) {
  test_valid_counter_style_descriptor('additive-symbols', value, expected);
}

function test_invalid_additive_symbols(value) {
  test_invalid_counter_style_descriptor('additive-symbols', value);
}

// [ <integer [0,∞]> && <symbol> ]#

test_valid_additive_symbols('0 "X"');
test_valid_additive_symbols('1 "X"');
test_valid_additive_symbols('"X" 1', '1 "X"');
test_valid_additive_symbols('5 "V", 1 "I"');

test_invalid_additive_symbols('');

// Weights must be non-negative
test_invalid_additive_symbols('-1 "X"');

// Weights must be in strictly decreasing order
test_invalid_additive_symbols('1 "I", 5 "V"');
test_invalid_additive_symbols('1 "X", 1 "Y"');
</script>