add detect for data uri iframes

feature-detects/iframe/datauri.js

@@ -0,0 +1,40 @@
+/*!
+{
+  "name": "DataURI based iframe",
+  "property": "datauriiframe",
+  "notes": [{
+    "name": "Internet Explorer reference on the data Protocol",
+    "href": "https://msdn.microsoft.com/en-us/library/cc848897(v=vs.85).aspx"
+  }]
+}
+!*/
+/* DOC
+Detects support for using a data uri for iframes
+*/
+define(['Modernizr', 'createElement', 'docElement', 'getBody'], function(Modernizr, createElement, docElement, getBody) {
+  Modernizr.addTest('datauriiframe', function() {
+    var iframe = createElement('iframe');
+    var body = getBody();
+    var support;
+
+    iframe.style.display = 'none';
+    iframe.src = 'data:text/html;base64,Kg==';
+
+    try {
+      if (!docElement.contains(body)) {
+        docElement.appendChild(body);
+      }
+      body.appendChild(iframe);
+      support = !!iframe.contentDocument;
+    } catch (e) {
+    } finally {
+      body.removeChild(iframe);
+
+      if (body.fake && body.parentNode) {
+        body.parentNode.removeChild(body);
+      }
+    }
+
+    return support;
+  });
+});

lib/config-all.json

@@ -243,6 +243,7 @@
     "templatestrings",
     "test/css/scrollsnappoints",
     "test/elem/bdi",
+    "test/iframe/datauri",
     "test/img/crossorigin",
     "test/ligatures",
     "textarea/maxlength",