diff --git a/test/client/stringify.spec.js b/test/client/stringify.spec.js
index 213d1895f..5127f46b2 100644
--- a/test/client/stringify.spec.js
+++ b/test/client/stringify.spec.js
@@ -64,14 +64,14 @@ describe('stringify', function () {
   it('should serialize html', function () {
     var div = document.createElement('div')
 
-    assert.deepEqual(stringify(div).trim(), '<div></div>')
+    assert.deepEqual(stringify(div).trim().toLowerCase(), '<div></div>')
 
     div.innerHTML = 'some <span>text</span>'
-    assert.deepEqual(stringify(div), '<div>some <span>text</span></div>')
+    assert.deepEqual(stringify(div).trim().toLowerCase(), '<div>some <span>text</span></div>')
   })
 
   it('should serialize DOMParser objects', function () {
-    if (DOMParser) {
+    if (typeof DOMParser !== 'undefined') {
       // Test only works in IE 9 and above
       var parser = new DOMParser()
       var doc = parser.parseFromString('<test></test>', 'application/xml')
@@ -81,7 +81,7 @@ describe('stringify', function () {
 
   it('should serialize across iframes', function () {
     var div = document.createElement('div')
-    assert.deepEqual(__karma__.stringify(div).trim(), '<div></div>')
+    assert.deepEqual(__karma__.stringify(div).trim().toLowerCase(), '<div></div>')
 
     assert.deepEqual(__karma__.stringify([1, 2]), '[1, 2]')
   })