Only use createElement for HTML.

Related d3/d3#2737.

Author: mbostock

package.json

@@ -1,6 +1,6 @@
 {
   "name": "d3-selection",
-  "version": "0.6.10",
+  "version": "0.6.11",
   "description": "Data-driven DOM manipulation: select elements and join them to data.",
   "keywords": [
     "d3",

src/creator.js

@@ -1,12 +1,13 @@
 import namespace from "./namespace";
+import {xhtml} from "./namespaces";
 
 function creatorInherit(name) {
   return function() {
     var document = this.ownerDocument,
         uri = this.namespaceURI;
-    return uri && uri !== document.documentElement.namespaceURI
-        ? document.createElementNS(uri, name)
-        : document.createElement(name);
+    return uri === xhtml && document.documentElement.namespaceURI === xhtml
+        ? document.createElement(name)
+        : document.createElementNS(uri, name);
   };
 }
 

src/namespaces.js

@@ -1,6 +1,8 @@
+export var xhtml = "http://www.w3.org/1999/xhtml";
+
 export default {
   svg: "http://www.w3.org/2000/svg",
-  xhtml: "http://www.w3.org/1999/xhtml",
+  xhtml: xhtml,
   xlink: "http://www.w3.org/1999/xlink",
   xml: "http://www.w3.org/XML/1998/namespace",
   xmlns: "http://www.w3.org/2000/xmlns/"