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Would you like to look at my piwik.js file and see what black-hat evils I'm hiding? Be my guest. For obvious reasons it isn't blocked to humans
If you are hiding CSS/JS from search engines, you probably have something to hide
But if GoogleBot can't look at this file to check it contains "no evil", why should they trust your page/site? If they can't trust it, why should they rank it?
var piwikTracker = Piwik.getTracker("http://www.example.com/piwik/piwik.php", 1);
I wonder if they follow their own suggestions
with css blocked how are you generating such pretty website previews without ignoring the block?
Just rank to dang content and be done with it.
You can't just slap a "noindex" at the top the way you do in html.
Robots meta tags and X-Robots-Tag HTTP headers are discovered when a URL is crawled. If a page is disallowed from crawling through the robots.txt file, then any information about indexing or serving directives will not be found and will therefore be ignored. If indexing or serving directives must be followed, the URLs containing those directives cannot be disallowed from crawling.
You can only note the fact that it exists.
in my experience so far Google only seems to fetch CSS files once every couple of weeks or so. It's not something you tend to change that often after all.