diff --git a/Tests/LibWeb/Text/expected/HTML/DOMParser-parseFromString-document-url.txt b/Tests/LibWeb/Text/expected/HTML/DOMParser-parseFromString-document-url.txt
new file mode 100644
index 00000000000..fc9aea9c083
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/HTML/DOMParser-parseFromString-document-url.txt
@@ -0,0 +1,2 @@
+PASS text/html
+PASS application/xhtml+xml
diff --git a/Tests/LibWeb/Text/input/HTML/DOMParser-parseFromString-document-url.html b/Tests/LibWeb/Text/input/HTML/DOMParser-parseFromString-document-url.html
new file mode 100644
index 00000000000..f3cacc504a3
--- /dev/null
+++ b/Tests/LibWeb/Text/input/HTML/DOMParser-parseFromString-document-url.html
@@ -0,0 +1,19 @@
+<script src="../include.js"></script>
+<script>
+    test(() => {
+        const parser = new DOMParser();
+
+        for (const mimeType of ["text/html", "application/xhtml+xml"]) {
+            const doc = parser.parseFromString("<html><b>hello", mimeType);
+            if (doc.URL == "about:blank") {
+                println("FAIL 1 " + mimeType);
+            } else if (!doc.URL.endsWith(".html")) {
+                println("FAIL 2 " + mimeType);
+            } else if (doc.URL == document.URL) {
+                println("PASS " + mimeType);
+            } else {
+                println("FAIL 3 " + mimeType);
+            }
+        }
+    });
+</script>
diff --git a/Userland/Libraries/LibWeb/DOM/Document.cpp b/Userland/Libraries/LibWeb/DOM/Document.cpp
index 4242a0f7b3e..3a69696c545 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Document.cpp
@@ -5415,8 +5415,7 @@ void Document::parse_html_from_a_string(StringView html)
     auto parser = HTML::HTMLParser::create(*this, html, "UTF-8"sv);
 
     // 4. Start parser and let it run until it has consumed all the characters just inserted into the input stream.
-    // FIXME: This is to match the default URL. Instead, pass in this's relevant global object's associated Document's URL.
-    parser->run("about:blank"sv);
+    parser->run(verify_cast<HTML::Window>(HTML::relevant_global_object(*this)).associated_document().url());
 }
 
 // https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#dom-parsehtmlunsafe
