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diff --git a/layout/reftests/border-radius/scrollbar-clamping-1-ref.html b/layout/reftests/border-radius/scrollbar-clamping-1-ref.html
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+<!DOCTYPE HTML>
+<html dir="ltr">
+<title>Test of reduction of border-radius for scrollbars (border drawing)</title>
+<style>
+
+.contain { height: 130px; position: relative }
+
+.test {
+  position: absolute;
+  top: 0;
+  left: 0;
+  /* border-width: 2px 4px 8px 10px; */
+  height: 100px;
+  width: 200px;
+  /* border-radius: 12px / 15px; */
+  border: medium solid blue;
+  border-width: 2px 4px 8px 10px;
+}
+
+.cover {
+  position: absolute;
+  width: 200px;
+  height: 100px;
+  top: 2px;
+  left: 10px;
+  background: blue;
+}
+
+</style>
+
+<div class="contain">
+  <!-- scrollbar along bottom -->
+  <div class="test" id="x" style="border-radius: 12px 12px 6.4px 10px / 15px 15px 8px 12.5px"></div>
+  <div class="cover" style="border-top-right-radius: 5px"></div>
+</div>
+
+<div class="contain">
+  <!-- scrollbar along right -->
+  <div class="test" id="y" style="border-radius: 12px 4px 6.4px 12px / 15px 5px 8px 15px"></div>
+  <div class="cover"></div>
+</div>
+
+<div class="contain">
+  <!-- scrollbar along bottom and right -->
+  <div class="test" id="xy" style="border-radius: 12px 4px 6.4px 10px / 15px 5px 8px 12.5px"></div>
+  <div class="cover"></div>
+</div>