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+++ b/testing/web-platform/tests/mathml/relations/html5-tree/color-attributes-1.html
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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>Color Attributes</title>
+<link rel="help" href="https://w3c.github.io/mathml-core/#css-styling">
+<link rel="help" href="https://w3c.github.io/mathml-core/#legacy-mathml-style-attributes">
+<meta name="assert" content="Verify that the mathcolor and mathbackground attributes are supported on the math element.">
+<link rel="match" href="color-attributes-1-ref.html"/>
+<style>
+  #content {
+    color: red;
+  }
+  #content > div {
+    position: absolute;
+  }
+</style>
+</head>
+<body>
+
+  <p>Test passes if you see the text below is written in white on a green
+    background.</p>
+
+  <div id="content">
+    <div>
+      <math style="background: red;">
+        <mtext style="visibility: hidden;">Hello World!</mtext>
+      </math>
+    </div>
+    <div>
+      <math mathcolor="white" mathbackground="green">
+        <mtext>Hello World!</mtext>
+      </math>
+    </div>
+  </div>
+
+</body>
+</html>