fix(input): copy custom attrs from ion-input to native input

ionic/util/dom.ts

@@ -198,6 +198,20 @@ export function hasFocusedTextInput() {
   return false;
 }
 
+const skipInputAttrsReg = /^(value|checked|disabled|type|class|style|id)$/i
+export function copyInputAttributes(srcElement, destElement) {
+  // copy attributes from one element to another
+  // however, skip over a few of them as they're already
+  // handled in the angular world
+  let attrs = srcElement.attributes;
+  for (let i = 0; i < attrs.length; i++) {
+    var attr = attrs[i];
+    if (!skipInputAttrsReg.test(attr.name)) {
+      destElement.setAttribute(attr.name, attr.value);
+    }
+  }
+}
+
 let matchesFn: string;
 let matchesMethods: Array<string> = ['matches','webkitMatchesSelector','mozMatchesSelector','msMatchesSelector'];
 matchesMethods.some((fn: string) => {