What are non standard attributes use for?

Question

Today, I was parsing google's HTML and faced with some non standard HTML's attributes. Take a look at this:

As you know, there isn't either jsname or jsdata or .. attributes in HTML. Well I'm just curious, what google use them for?

Answer 1

jsaction attribute is added by Google's jsaction library. It's source code can be found on project's GitHub page: https://github.com/google/jsaction

I have no idea about the other attributes though.