diff --git a/css/selectors/invalidation/part-pseudo-ref.html b/css/selectors/invalidation/part-pseudo-ref.html
deleted file mode 100644
index aeb724778a78e17..000000000000000
--- a/css/selectors/invalidation/part-pseudo-ref.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<head>
-  <meta charset="utf-8">
-  <title>CSS Test Reference</title>
-  <style id="sheet">div { color: green; }</style>
-</head>
-<body>
-  <div>
-    <div>
-      <div>Should be green</div>
-    </div>
-  </div>
-</body>
diff --git a/css/selectors/invalidation/part-pseudo.html b/css/selectors/invalidation/part-pseudo.html
deleted file mode 100644
index a409271762fb41a..000000000000000
--- a/css/selectors/invalidation/part-pseudo.html
+++ /dev/null
@@ -1,23 +0,0 @@
-<!DOCTYPE html>
-<head>
-  <meta charset="utf-8">
-  <title>CSS Selectors Invalidation: ::part()</title>
-  <link rel="author" title="Steinar H. Gunderson" href="mailto:sesse@chromium.org">
-  <link rel="help" href="https://drafts.csswg.org/css-shadow-parts/">
-  <link rel="match" href="part-pseudo-ref.html">
-  <style id="sheet">#host::part(green) { color: red; }</style>
-  <script src="/resources/declarative-shadow-dom-polyfill.js"></script>
-</head>
-<body>
-  <div id="host">
-    <template shadowrootmode="open">
-      <div>
-        <div part="green">Should be green</div>
-      </div>
-    </template>
-  </div>
-  <script>
-    document.body.offsetTop;
-    sheet.innerText = "#host::part(green) { color: green; }";
-  </script>
-</body>
