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Chasing after them can teach you some interesting technical tricks sometimes. Like the way they manipulate the browser history when you land on their page so that even if you click on the Back button of the browser you are still on their website

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Nothing really extraordinary technically speaking. This is because there is an intermediate domain with a redirect. Two clicks "back", is you are back on the original comment on Steemit.

One of the sites I saw is pushing a lot of fake URLs in the history and even with ten clicks back you’re still on their site which will again change the history. They saturate the history by doing a pushState() in a loop at each page load.