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Re:Headless mode in Firefox by dboreham on Wednesday August 30, 2017 @01:48PM (#15134299)
To add to the sibling posts:

Crawling the Web. Although you might think that you can crawl a web site by poking through the HTML looking for <a> tags and opening the URLs they contain; that stopped working well a long time ago. Modern sites are essentially complex GUI applications that run inside...a browser. You need either a browser, or some browser-equivalent thing therefore in order to run them and properly crawl them.

Re:Headless mode in Firefox by camoby on Wednesday August 30, 2017 @02:49PM (#15134831)
Isn’t this why these ‘headless’ solution have (or are actually built on) JavaScrict engines like V8 with the ability to also simulate any user interaction?