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+++ b/testing/web-platform/tests/css/CSS2/syntax/case-sensitive-001.xht
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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+ <head>
+  <title>CSS Test: Case-sensitivity of At-rules (@media)</title>
+  <link rel="author" title="L. David Baron" href="https://dbaron.org/"/>
+  <link rel="help" href="http://www.w3.org/TR/CSS21/syndata.html#characters"/>
+  <link rel="match" href="../reference/ref-green-background.xht"/>
+  <style type="text/css">
+
+  p { color: white; }
+  @media all {
+   p { background: url(support/swatch-red.png); }
+  }
+
+  @MeDIa aLL {
+   p { BacKgrOUNd: UrL(support/swatch-green.png); }
+  }
+
+  </style>
+ </head>
+ <body>
+
+ <p>This should have a green background.</p>
+
+ </body>
+</html>