diff --git a/Tests/LibWeb/Text/expected/DOM/HTMLCollection-empty-string-as-property-name.txt b/Tests/LibWeb/Text/expected/DOM/HTMLCollection-empty-string-as-property-name.txt
new file mode 100644
index 00000000000..223b72b3006
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/DOM/HTMLCollection-empty-string-as-property-name.txt
@@ -0,0 +1,2 @@
+   Empty string in collection: false
+'haxx' in collection: true
diff --git a/Tests/LibWeb/Text/input/DOM/HTMLCollection-empty-string-as-property-name.html b/Tests/LibWeb/Text/input/DOM/HTMLCollection-empty-string-as-property-name.html
new file mode 100644
index 00000000000..259d4d49dd6
--- /dev/null
+++ b/Tests/LibWeb/Text/input/DOM/HTMLCollection-empty-string-as-property-name.html
@@ -0,0 +1,10 @@
+<script src="../include.js"></script>
+<div id></div>
+<div id=haxx></div>
+<script>
+    test(() => {
+        var c = document.getElementsByTagName("*");
+        println("Empty string in collection: " + ("" in c));
+        println("'haxx' in collection: " + ("haxx" in c));
+    });
+</script>
diff --git a/Userland/Libraries/LibWeb/DOM/HTMLCollection.cpp b/Userland/Libraries/LibWeb/DOM/HTMLCollection.cpp
index 2286f91d124..07535ea1457 100644
--- a/Userland/Libraries/LibWeb/DOM/HTMLCollection.cpp
+++ b/Userland/Libraries/LibWeb/DOM/HTMLCollection.cpp
@@ -135,7 +135,7 @@ Vector<FlyString> HTMLCollection::supported_property_names() const
     for (auto const& element : m_cached_elements) {
         // 1. If element has an ID which is not in result, append element’s ID to result.
         if (auto const& id = element->id(); id.has_value()) {
-            if (!result.contains_slow(id.value()))
+            if (!id.value().is_empty() && !result.contains_slow(id.value()))
                 result.append(id.value());
         }