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-rw-r--r--testing/web-platform/tests/css/css-counter-styles/cssom/cssom-additive-symbols-setter.html26
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diff --git a/testing/web-platform/tests/css/css-counter-styles/cssom/cssom-additive-symbols-setter.html b/testing/web-platform/tests/css/css-counter-styles/cssom/cssom-additive-symbols-setter.html
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+++ b/testing/web-platform/tests/css/css-counter-styles/cssom/cssom-additive-symbols-setter.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<title>CSSCounterStyleRule additiveSymbols setter</title>
+<link rel="help" href="https://www.w3.org/TR/css-counter-styles-3/#the-csscounterstylerule-interface">
+<link rel="author" href="mailto:xiaochengh@chromium.org">
+<link rel="match" href="cssom-additive-symbols-setter-ref.html">
+<style id="sheet">
+@counter-style foo {
+ system: additive;
+ additive-symbols: 1 I, 0 O;
+}
+</style>
+
+<ol style="list-style-type: foo; list-style-position: inside" start=0>
+ <li></li>
+ <li></li>
+ <li></li>
+</ol>
+
+<script>
+// Force layout update before changing the rule
+document.body.offsetWidth;
+
+const sheet = document.getElementById('sheet');
+const foo_rule = sheet.sheet.rules[0];
+foo_rule.additiveSymbols = '2 C, 1 B, 0 A';
+</script>