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Say someone else has a website generated by JavaScript, so I can’t go look at the source and read what should be on the screen. How can I grab the text on the screen so I can feed it into another program? Also, how can I write a program that automatically clicks on radio buttons, links, etc. that satisfy certain criteria?
You can write a web scraping tool in Perl or Python. Or, you can use existing tools and frameworks to achieve that.
Check out Scrapy, an open-source tool written in Python.
Take a look at Selenium too.