Fix issues with foreignobject sanitizing

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index 88635ec6376e55e5ee9ce338373c8747e990fadf..6288e9eab21da774c3c9c3c93ea147f0867d8187 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -40417,8 +40417,9 @@ class _SvgNodeValidator implements NodeValidator {
     }
     // Firefox 37 has issues with creating foreign elements inside a
     // foreignobject tag as SvgElement. We don't want foreignobject contents
-    // anyway, so just remove the whole tree outright.
-    if (element is svg.ForeignObjectElement) {
+    // anyway, so just remove the whole tree outright. And we can't rely
+    // on IE recognizing the SvgForeignObject type, so go by tagName. Bug 23144
+    if (element is svg.SvgElement && element.tagName == 'foreignObject') {
       return false;
     }
     if (element is svg.SvgElement) {