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+++ b/layout/reftests/w3c-css/submitted/contain/contain-paint-formatting-context-margin-001-ref.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>CSS Reftest Test</title>
+  <link rel="author" title="Kyle Zentner" href="mailto:zentner.kyle@gmail.com">
+  <style>
+  body {
+    margin: 0;
+  }
+  #a {
+      background: blue;
+      margin: 10px;
+      width: 50px;
+      height: 50px;
+  }
+  #b {
+      width: 50px;
+      height: 40px;
+      background: green;
+  }
+  #b-padding {
+      height: 10px;
+  }
+  </style>
+</head>
+<body>
+  <div id="a">
+    <div id="b-padding"></div>
+    <div id="b"></div>
+  </div>
+</body>
+</html>