diff --git a/Base/res/html/misc/focus.html b/Base/res/html/misc/focus.html
new file mode 100644
index 0000000000..a85d54f548
--- /dev/null
+++ b/Base/res/html/misc/focus.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>:focus and :focus-within test</title>
+    <style>
+        :focus {
+            background-color: magenta;
+        }
+        p.focus-within-test:focus-within {
+            background-color: lime;
+        }
+    </style>
+</head>
+<body>
+    <h1>:focus and :focus-within test</h1>
+    <p>
+        Anything with :focus will have a magenta background.
+        <button>I'm a button</button>
+        <input type="text" value="Hello friends!"/>
+    </p>
+    <p class="focus-within-test">
+        This paragraph will turn green if anything inside it is focused.
+        <button>I'm a button</button>
+        <input type="text" value="Hello friends!"/>
+    </p>
+</body>
+</html>
diff --git a/Base/res/html/misc/welcome.html b/Base/res/html/misc/welcome.html
index 7ec47402fd..8937bdb7df 100644
--- a/Base/res/html/misc/welcome.html
+++ b/Base/res/html/misc/welcome.html
@@ -101,6 +101,7 @@
             <li><a href="not-selector.html">:not()</a></li>
             <li><a href="where-selector.html">:where()</a></li>
             <li><a href="hover.html">:hover</a></li>
+            <li><a href="focus.html">:focus</a></li>
             <li><h3>Properties</h3></li>
             <li><a href="backgrounds.html">Backgrounds</a></li>
             <li><a href="background-repeat-test.html">Background-repeat</a></li>
