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+<!DOCTYPE html>
+<html lang=en>
+<meta charset="utf-8">
+<title>Selectors Level 4: focus-within</title>
+<link rel="author" title="Keyong Li" href="mailto:kli79@bloomberg.net">
+<link rel="author" title="Florian Rivoal" href="mailto:florian@rivoal.net">
+<link rel="help" href="https://drafts.csswg.org/selectors-4/#focus-within-pseudo">
+<link rel="match" href="focus-within-001-ref.html">
+<meta name="flags" content="interact">
+<meta name="assert" content="Test that :focus-within works on form controls, using an input element.">
+<style>
+/* Suppress things that cannot be reproduced in the reference file */
+:focus {
+  all: initial;
+  outline: none;
+
+  /* Make the caret invisible
+     since it matches the color of the text, which is transparent,
+     while keeping the text readable thanks to its shadow.
+     Not using the caret-color property as it is too new to be relied on. */
+  color: transparent; text-shadow: black 0px 0px 0px;
+}
+
+/* Use blue to indicate that the user needs to pay attention.
+   This element needs to be focused for the test to make sense. */
+#focusme:not(:focus) {
+  border: solid 15px blue;
+}
+
+#focusme:focus:not(:focus-within) {
+  background: red;
+}
+div:focus-within {
+  border: solid 5px green;
+}
+</style>
+<p>Test passes if, when the element below is focused,
+it is surrounded by a thick green border.
+There must be no red or blue once it is focused.</p>
+<div>
+  <div>
+    <div>
+      <input id="focusme" class="reftest-wait" onfocus="this.classList.toggle('reftest-wait');" value="Focus this element">
+    <div>
+  </div>
+</div>
+<script>
+/* This script is an optional convenience,
+   simply removing the need to manually focus the element.
+   The test is valid even if the script is not run. */
+var editor = document.getElementById('focusme');
+editor.focus();
+</script>
+<body>
+</html>