Interesting find! I'm rocking my daughter to sleep so don't have a chance to go any deeper, but I tried "site:docs.angularjs.org input radio button" and still c

Interesting find! I'm rocking my daughter to sleep so don't have a chance to go any deeper, but I tried "site:docs.angularjs.org input radio button" and still couldn't get a result from their site. If I search "docs.angularjs.org" I bring up that page in serps, but I still can't get any deep results. I'll take a look on my laptop and see if I can shed any light on this for you.