diff --git a/Base/res/html/misc/welcome.html b/Base/res/html/misc/welcome.html
index 9181d6e737..48da06eb4f 100644
--- a/Base/res/html/misc/welcome.html
+++ b/Base/res/html/misc/welcome.html
@@ -96,8 +96,9 @@
             <li><a href="nth-last-of-type.html">:nth-last-of-type</a></li>
             <li><a href="empty.html">:empty</a></li>
             <li><a href="root.html">:root</a></li>
-            <li><a href="is-selector.html">:is</a></li>
-            <li><a href="not-selector.html">:not</a></li>
+            <li><a href="is-selector.html">:is()</a></li>
+            <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><h3>Properties</h3></li>
             <li><a href="backgrounds.html">Backgrounds</a></li>
diff --git a/Base/res/html/misc/where-selector.html b/Base/res/html/misc/where-selector.html
new file mode 100644
index 0000000000..f5749a76a5
--- /dev/null
+++ b/Base/res/html/misc/where-selector.html
@@ -0,0 +1,38 @@
+<!doctype html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <title>:where() test</title>
+    <style>
+        div {
+            border: 1px solid black;
+            margin-bottom: 1em;
+            padding: 0 0.5em;
+        }
+        .special :where(h2, p) {
+            background-color: lime;
+        }
+        .forgiving :where(&&&fakhsdaskjhd, h2, p) {
+            background-color: lime;
+        }
+    </style>
+</head>
+<body>
+    <h1>:where() test</h1>
+    <div>
+        <h2>Nothing</h2>
+        <p>These should have no background.</p>
+    </div>
+    <br/>
+    <div class="special">
+        <h2>.special :where(h2, p)</h2>
+        <p>These should have a green background.</p>
+    </div>
+    <br/>
+    <div class="forgiving">
+        <h2>.forgiving :where(&&&fakhsdaskjhd, h2, p)</h2>
+        <p>These should have a green background. :where() takes a "permissive selector list",
+            so even though part of it is invalid, this does not make the whole selector-list invalid.</p>
+    </div>
+</body>
+</html>
