refactor($sanitize): new implementation of the html sanitized parser

This implementation is based on using inert document parsed by the browser

Closes #11442
Closes #11443
Closes #12524

Author: mhevery

docs/content/error/$sanitize/badparse.ngdoc

@@ -0,0 +1,10 @@
+@ngdoc error
+@name $sanitize:ddns
+@fullName DOMDocument not supported
+@description
+
+This error occurs when `$sanitize` sanitizer determines that `DOMDocument` api is not supported by the current browser.
+
+This api is necessary for safe parsing of HTML strings into DOM trees and without it the sanitizer can't sanitize the input.
+
+The api is present in all supported browsers including IE 9.0, so the presence of this error usually indicates that Angular's `$sanitize` is being used on an unsupported platform.