diff --git a/Tests/LibWeb/Text/expected/css/unknown-pseudo-elements-crash.txt b/Tests/LibWeb/Text/expected/css/unknown-pseudo-elements-crash.txt
new file mode 100644
index 00000000000..aaecaf93c4a
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/css/unknown-pseudo-elements-crash.txt
@@ -0,0 +1 @@
+PASS (didn't crash)
diff --git a/Tests/LibWeb/Text/input/css/unknown-pseudo-elements-crash.html b/Tests/LibWeb/Text/input/css/unknown-pseudo-elements-crash.html
new file mode 100644
index 00000000000..582ef65c89c
--- /dev/null
+++ b/Tests/LibWeb/Text/input/css/unknown-pseudo-elements-crash.html
@@ -0,0 +1,7 @@
+<script src="../include.js"></script>
+<script>
+    test(() => {
+        getComputedStyle(document.body, "::-webkit-scrollbar").display;
+        println("PASS (didn't crash)");
+    });
+</script>