diff --git a/src/browser/tests/domparser.html b/src/browser/tests/domparser.html
index cd701d59..7f08b1ef 100644
--- a/src/browser/tests/domparser.html
+++ b/src/browser/tests/domparser.html
@@ -107,19 +107,6 @@
 }
 </script>
 
-<script id=unsupportedMimeType>
-{
-  const parser = new DOMParser();
-
-  // Should throw an error for unsupported MIME types
-  testing.withError((err) => {
-    testing.expectEqual('NotSupported', err.message);
-  }, () => {
-    parser.parseFromString('<div>test</div>', 'application/xml');
-  });
-}
-</script>
-
 <script id=getElementById>
 {
   const doc = new DOMParser().parseFromString('<div id="new-node">new-node</div>', 'text/html');
@@ -244,3 +231,161 @@
   testing.expectEqual('<html><head></head><body>spice</body></html>', new DOMParser().parseFromString('spice', "text/html").documentElement.outerHTML);
   testing.expectEqual('<html><head></head><body></body></html>', new DOMParser().parseFromString('<html></html>', "text/html").documentElement.outerHTML);
 </script>
+
+<script id=parse-xml>
+{
+  const sampleXML = `<?xml version="1.0"?>
+    <catalog>
+       <book id="bk101">
+          <author>Gambardella, Matthew</author>
+          <title>XML Developer's Guide</title>
+          <genre>Computer</genre>
+          <price>44.95</price>
+          <publish_date>2000-10-01</publish_date>
+          <description>An in-depth look at creating applications
+          with XML.</description>
+       </book>
+       <book id="bk102">
+          <author>Ralls, Kim</author>
+          <title>Midnight Rain</title>
+          <genre>Fantasy</genre>
+          <price>5.95</price>
+          <publish_date>2000-12-16</publish_date>
+          <description>A former architect battles corporate zombies,
+          an evil sorceress, and her own childhood to become queen
+          of the world.</description>
+       </book>
+       <book id="bk103">
+          <author>Corets, Eva</author>
+          <title>Maeve Ascendant</title>
+          <genre>Fantasy</genre>
+          <price>5.95</price>
+          <publish_date>2000-11-17</publish_date>
+          <description>After the collapse of a nanotechnology
+          society in England, the young survivors lay the
+          foundation for a new society.</description>
+       </book>
+       <book id="bk104">
+          <author>Corets, Eva</author>
+          <title>Oberon's Legacy</title>
+          <genre>Fantasy</genre>
+          <price>5.95</price>
+          <publish_date>2001-03-10</publish_date>
+          <description>In post-apocalypse England, the mysterious
+          agent known only as Oberon helps to create a new life
+          for the inhabitants of London. Sequel to Maeve
+          Ascendant.</description>
+       </book>
+       <book id="bk105">
+          <author>Corets, Eva</author>
+          <title>The Sundered Grail</title>
+          <genre>Fantasy</genre>
+          <price>5.95</price>
+          <publish_date>2001-09-10</publish_date>
+          <description>The two daughters of Maeve, half-sisters,
+          battle one another for control of England. Sequel to
+          Oberon's Legacy.</description>
+       </book>
+       <book id="bk106">
+          <author>Randall, Cynthia</author>
+          <title>Lover Birds</title>
+          <genre>Romance</genre>
+          <price>4.95</price>
+          <publish_date>2000-09-02</publish_date>
+          <description>When Carla meets Paul at an ornithology
+          conference, tempers fly as feathers get ruffled.</description>
+       </book>
+       <book id="bk107">
+          <author>Thurman, Paula</author>
+          <title>Splish Splash</title>
+          <genre>Romance</genre>
+          <price>4.95</price>
+          <publish_date>2000-11-02</publish_date>
+          <description>A deep sea diver finds true love twenty
+          thousand leagues beneath the sea.</description>
+       </book>
+       <book id="bk108">
+          <author>Knorr, Stefan</author>
+          <title>Creepy Crawlies</title>
+          <genre>Horror</genre>
+          <price>4.95</price>
+          <publish_date>2000-12-06</publish_date>
+          <description>An anthology of horror stories about roaches,
+          centipedes, scorpions  and other insects.</description>
+       </book>
+       <book id="bk109">
+          <author>Kress, Peter</author>
+          <title>Paradox Lost</title>
+          <genre>Science Fiction</genre>
+          <price>6.95</price>
+          <publish_date>2000-11-02</publish_date>
+          <description>After an inadvertant trip through a Heisenberg
+          Uncertainty Device, James Salway discovers the problems
+          of being quantum.</description>
+       </book>
+       <book id="bk110">
+          <author>O'Brien, Tim</author>
+          <title>Microsoft .NET: The Programming Bible</title>
+          <genre>Computer</genre>
+          <price>36.95</price>
+          <publish_date>2000-12-09</publish_date>
+          <description>Microsoft's .NET initiative is explored in
+          detail in this deep programmer's reference.</description>
+       </book>
+       <book id="bk111">
+          <author>O'Brien, Tim</author>
+          <title>MSXML3: A Comprehensive Guide</title>
+          <genre>Computer</genre>
+          <price>36.95</price>
+          <publish_date>2000-12-01</publish_date>
+          <description>The Microsoft MSXML3 parser is covered in
+          detail, with attention to XML DOM interfaces, XSLT processing,
+          SAX and more.</description>
+       </book>
+       <book id="bk112">
+          <author>Galos, Mike</author>
+          <title>Visual Studio 7: A Comprehensive Guide</title>
+          <genre>Computer</genre>
+          <price>49.95</price>
+          <publish_date>2001-04-16</publish_date>
+          <description>Microsoft Visual Studio 7 is explored in depth,
+          looking at how Visual Basic, Visual C++, C#, and ASP+ are
+          integrated into a comprehensive development
+          environment.</description>
+       </book>
+    </catalog>`;
+
+  const parser = new DOMParser();
+  const mimes = [
+    "text/xml",
+    "application/xml",
+    "application/xhtml+xml",
+    "image/svg+xml",
+  ];
+
+  for (const mime of mimes) {
+    const doc = parser.parseFromString(sampleXML, "text/xml");
+    const { firstChild: { childNodes, children: collection, tagName }, children } = doc;
+    // doc.
+    testing.expectEqual(true, doc instanceof XMLDocument);
+    testing.expectEqual(1, children.length);
+    // firstChild.
+    // TODO: Modern browsers expect this in lowercase.
+    testing.expectEqual("CATALOG", tagName);
+    testing.expectEqual(25, childNodes.length);
+    testing.expectEqual(12, collection.length);
+    // Check children of first child.
+    for (let i = 0; i < collection.length; i++) {
+      const {children: elements, id} = collection.item(i);
+      testing.expectEqual("bk" + (100 + i + 1), id);
+      // TODO: Modern browsers expect these in lowercase.
+      testing.expectEqual("AUTHOR", elements.item(0).tagName);
+      testing.expectEqual("TITLE", elements.item(1).tagName);
+      testing.expectEqual("GENRE", elements.item(2).tagName);
+      testing.expectEqual("PRICE", elements.item(3).tagName);
+      testing.expectEqual("PUBLISH_DATE", elements.item(4).tagName);
+      testing.expectEqual("DESCRIPTION", elements.item(5).tagName);
+    }
+  }
+}
+</script>
