diff --git a/css/selectors4/focus-within-007-ref.html b/css/selectors4/focus-within-007-ref.html
new file mode 100644
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+++ b/css/selectors4/focus-within-007-ref.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Selectors Level 4: focus-within Reference File</title>
+<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
+<style>
+  html, body, div {
+      border: solid 5px green;
+  }
+</style>
+<p>Test passes if, when the element below is focused, it is surrounded by a green border, and HTML and BODY elements also have a green border. There must be no red or blue once it is focused.</p>
+<div>Focus this element</div>
diff --git a/css/selectors4/focus-within-007.html b/css/selectors4/focus-within-007.html
new file mode 100644
index 00000000000000..f23fe87643fa7e
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+++ b/css/selectors4/focus-within-007.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+<meta charset="utf-8">
+<title>Selectors Level 4: focus-within</title>
+<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/selectors-4/#focus-within-pseudo">
+<link rel="match" href="focus-within-007-ref.html">
+<meta name="assert" content="Checks that ':focus-within' can be used as universal selector.">
+<style>
+  /* Suppress things that cannot be reproduced in the reference file */
+  :focus {
+    outline: none;
+  }
+  html, body, div {
+      border: solid 5px red;
+  }
+  /* Use blue to indicate that the user needs to pay attention.
+     This element needs to be focused for the test to make sense. */
+  div {
+      border-color: blue;
+  }
+  :focus-within {
+      border-color: green;
+  }
+</style>
+<p>Test passes if, when the element below is focused, it is surrounded by a green border, and HTML and BODY elements also have a green border. There must be no red or blue once it is focused.</p>
+<div id="focusme" tabindex="1">Focus this element</div>
+<script>
+  var focusme = document.getElementById('focusme');
+  focusme.focus();
+  document.documentElement.classList.remove('reftest-wait');
+</script>
+</html>
diff --git a/css/selectors4/focus-within-008.html b/css/selectors4/focus-within-008.html
new file mode 100644
index 00000000000000..19deff212a38bd
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+++ b/css/selectors4/focus-within-008.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<meta charset="utf-8">
+<title>Selectors Level 4: focus-within</title>
+<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/selectors-4/#focus-within-pseudo">
+<link rel="match" href="focus-within-007-ref.html">
+<meta name="assert" content="Checks that ':focus-within' can be used as universal selector (using *).">
+<style>
+  /* Suppress things that cannot be reproduced in the reference file */
+  :focus {
+    outline: none;
+  }
+  html, body, div {
+      border: solid 5px red;
+  }
+  /* Use blue to indicate that the user needs to pay attention.
+     This element needs to be focused for the test to make sense. */
+  div {
+      border-color: blue;
+  }
+  *:focus-within {
+      border-color: green;
+  }
+</style>
+<p>Test passes if, when the element below is focused, it is surrounded by a green border, and HTML and BODY elements also have a green border. There must be no red or blue once it is focused.</p>
+<div id="focusme" tabindex="1">Focus this element</div>
+<script>
+  var focusme = document.getElementById('focusme');
+  focusme.focus();
+  document.documentElement.classList.remove('reftest-wait');
+</script>
+</html>
