Does Google have a separate crawler for Javascript and Content?

[MJTrevens]

Someone told me this is true.

[TucsonAZWebDesign]

Much similar to many of the rules and guidelines by which Google calculates search rankings, they don't openly provide that type of information to the general public, because obviously their users would take advantage of it and manipulate the crawlers for the purpose of altering their rankings.

If you wanted to know something like that for sure, you would probably need to conduct field research doing something extreme like having 100% javascript content in one segment of your site and 100% HTML on another and track which IPs and user agents hit the pages.

However an educated guess of mine believes this:

1. The bots that crawl HTML also crawl Javascript. To make separate bots to do individual tasks would be stupid.
2. there would be absolutely no benefit nor would the sanitation of the data the crawlers obtain be increased using seperate bots. Because it can be clearly concluded the difference between html and Javascript, and at an automated level as well.