Fix namespaces of elements created in XML documents

components/script/dom/document.rs

@@ -2772,7 +2772,14 @@ impl DocumentMethods for Document {
         if self.is_html_document {
             local_name.make_ascii_lowercase();
         }
-        let name = QualName::new(ns!(html), LocalName::from(local_name));
+
+        let ns = if self.is_html_document || self.content_type == "application/xhtml+xml" {
+            ns!(html)
+        } else {
+            ns!()
+        };
+
+        let name = QualName::new(ns, LocalName::from(local_name));
         Ok(Element::create(name, None, self, ElementCreator::ScriptCreated))
     }
 

tests/wpt/metadata/dom/nodes/Document-constructor.html.ini

@@ -0,0 +1,4 @@
+[Document-constructor.html]
+  type: testharness
+  [new Document(): URL parsing]
+    expected: FAIL

tests/wpt/mozilla/meta/MANIFEST.json

    "testharness"
   ],
   "mozilla/document_head.html": [
-   "31892b141aba3b317502e38a4a38fcd8531cb8aa",
+   "b861fe5a1159ba5fba44d3aee048cdb27d378be9",
    "testharness"
   ],
   "mozilla/document_images_cache.html": [

tests/wpt/mozilla/tests/mozilla/document_head.html

@@ -13,8 +13,8 @@
 
             test(function() {
                 var new_document = new Document();
-                new_document.appendChild(new_document.createElement("html"));
-                var new_head = new_document.createElement("head");
+                new_document.appendChild(new_document.createElementNS('http://www.w3.org/1999/xhtml', "html"));
+                var new_head = new_document.createElementNS('http://www.w3.org/1999/xhtml', 'head');
 
                 assert_not_equals(new_head, null, "test2-0, append head to a new document");
                 assert_true(new_head instanceof HTMLHeadElement, "test2-1, append head to a new document: should be HTMLHeadElement");
@@ -30,9 +30,9 @@
 
             test(function() {
                 var new_document = new Document();
-                var html = new_document.createElement("html");
-                var foo = new_document.createElement("foo");
-                var head = new_document.createElement("head");
+                var html = new_document.createElementNS('http://www.w3.org/1999/xhtml', "html");
+                var foo = new_document.createElementNS('http://www.w3.org/1999/xhtml', "foo");
+                var head = new_document.createElementNS('http://www.w3.org/1999/xhtml', "head");
                 new_document.appendChild(html);
                 html.appendChild(foo);
                 foo.appendChild(head);