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+<!DOCTYPE HTML>
+<meta charset="UTF-8">
+<title>CSS Toggles: toggle-visibility</title>
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Google" href="http://www.google.com/">
+<link rel="help" href="https://tabatkins.github.io/css-toggle/#toggle-visibility-property">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<style>
+
+body {
+  toggle-root: active-toggle 1 at 1;
+}
+
+#container {
+  toggle-visibility: toggle active-toggle;
+  background: red;
+  width: 100px;
+  height: 100px;
+}
+
+#child, #sibling {
+  height: 100px;
+  width: 100px;
+}
+
+#child {
+  background: green;
+}
+
+#sibling {
+  background: red;
+  margin-top: -100px;
+}
+
+</style>
+
+<body>
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div id="container">
+  <div id="child"></div>
+</div>
+<div id="sibling"></div>