webcomponents/webcomponentsjs — pull request #122 by thomasmarkiewicz (2014-12-12 00:53:11+00:00)
Title: Fix for a polymer mobile chrome app throwing 'TypeError: Attempted to as...

...sign to readonly property.' in iOS

See here this for more info and screenshots: https://github.com/MobileChromeApps/mobile-chrome-apps/issues/457

After this fix I get no more errors and radio buttons work in iOS.