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+<!DOCTYPE html>
+<html>
+  <meta charset="utf-8">
+  <title>Bug 1517385: Test AccessibleCaret doesn't occupied space when its appearance is Appearance::None.</title>
+
+  <style>
+  #content {
+    position: absolute;
+    font-size: 20px;
+    width: 20px;
+    top: 0;
+    right: 0;
+  }
+  </style>
+
+  <script>
+  function runTest() {
+    let sel = window.getSelection();
+    let content = document.getElementById("content");
+    sel.selectAllChildren(content);
+    sel.removeAllRanges();
+  }
+  </script>
+
+  <body onload="runTest()">
+    <div id="content">A</div>
+  </body>
+</html>