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diff --git a/testing/web-platform/tests/css/css-ruby/ruby-whitespace-001-ref.html b/testing/web-platform/tests/css/css-ruby/ruby-whitespace-001-ref.html
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index 0000000000..04fa59e6ba
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+++ b/testing/web-platform/tests/css/css-ruby/ruby-whitespace-001-ref.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>Ruby whitespace handling</title>
+<link rel="author" title="Sam Bowen" href="mailto:sgbowen8@gmail.com">
+<link rel="author" title="Mozilla" href="https://www.mozilla.org">
+<link rel="stylesheet" href="support/ruby-common.css">
+<style>
+body { line-height: 5em; }
+</style>
+
+<p>
+  <ruby><rbc><rb><span>   </span></rb><rb><span>    </span></rb><rb>Base three</rb></rbc
+    ><rtc><rt><span>   </span></rt><rt><span>   </span></rt><rt>Text three</rt></rtc
+    ><rtc><rt></rt></rtc
+    ><rbc><rb><span>        </span></rb></rbc
+    ><rbc><rb>Segment two</rb></rbc
+    ><rtc><rt></rt></rtc></ruby>
+</p>
+
+<p>
+  <ruby><rbc><rb>Base one</rb><rb><span>  </span></rb><rb>Base three</rb></rbc
+    ><rtc pseudo><rt>Text one</rt><rt pseudo><span>  </span></rt><rt>Text three</rt></rtc></ruby>
+</p>
+
+<p>
+  <ruby><rbc><rb>Segment one</rb></rbc
+    ><rbc><rb><span>  </span></rb></rbc
+    ><rbc><rb><span>  </span></rb><rb><span>    </span></rb><rb>Base three</rb></rbc
+    ><rtc><rt><span>  </span></rt><rt><span>     </span></rt><rt>Text three</rt></rtc
+    ><rbc><rb><span>  </span></rb></rbc
+    ><rbc><rb>Base one</rb><rb><span>   </span></rb><rb>Base three</rb></rbc
+    ><rtc><rt>Text one</rt><rt></rt><rt>Text two/three</rt></rtc></ruby>
+</p>