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diff --git a/layout/reftests/counter-style/redefine-attr-mapping.html b/layout/reftests/counter-style/redefine-attr-mapping.html
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+++ b/layout/reftests/counter-style/redefine-attr-mapping.html
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+<!DOCTYPE html>
+<link rel="stylesheet" href="test-common.css">
+<style type="text/css">
+  @counter-style triangle {
+    system: cyclic;
+    symbols: \2023;
+    suffix: "";
+  }
+  @counter-style disc {
+    system: extends triangle;
+  }
+  @counter-style circle {
+    system: extends triangle;
+  }
+  @counter-style square {
+    system: extends triangle;
+  }
+  @counter-style lower-roman {
+    system: extends hiragana;
+  }
+  @counter-style upper-roman {
+    system: extends katakana;
+  }
+  @counter-style lower-alpha {
+    system: extends hiragana-iroha;
+  }
+  @counter-style upper-alpha {
+    system: extends katakana-iroha;
+  }
+</style>
+<ul><li></ul>
+<ul type="disc"><li></ul>
+<ul type="circle"><li></ul>
+<ul type="round"><li></ul>
+<ul type="square"><li></ul>
+<ul type="i"><li></ul>
+<ul type="I"><li></ul>
+<ul type="a"><li></ul>
+<ul type="A"><li></ul>
+<ul type="lower-roman"><li></ul>
+<ul type="upper-roman"><li></ul>
+<ul type="lower-alpha"><li></ul>
+<ul type="upper-alpha"><li></ul>
+
+<ol><li></ol>
+<ol type="disc"><li></ol>
+<ol type="circle"><li></ol>
+<ol type="round"><li></ol>
+<ol type="square"><li></ol>
+<ol type="i"><li></ol>
+<ol type="I"><li></ol>
+<ol type="a"><li></ol>
+<ol type="A"><li></ol>
+<ol type="lower-roman"><li></ol>
+<ol type="upper-roman"><li></ol>
+<ol type="lower-alpha"><li></ol>
+<ol type="upper-alpha"><li></ol>
+
+<ul>
+  <li type="disc">
+  <li type="circle">
+  <li type="round">
+  <li type="square">
+  <li type="i">
+  <li type="I">
+  <li type="a">
+  <li type="A">
+</ul>