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For those that were confused by the title (like me), here's the TL;DR: Online advertiser, Epic Marketplace, is using a very sophisticated javascript script to
by gallamine 15y ago
For those that were confused by the title (like me), here's the TL;DR:
Online advertiser, Epic Marketplace, is using a very sophisticated javascript script to do "history stealing", where they iterate through thousands of URLs to determine if a user has visited them. With this data, they can serve highly targeted ads.
It's highly shady at best, and illegal at worst.
- juiceandjuice 15y agoVery sophisticated is almost an understatement.
- AdamTReineke 15y agoNot really. The Javascript loads an array of links to check against, builds a 1x1 pixel iframe, puts all the links in there (with styles applied to hide visited links), then it checks to see which links disappeared. Browsers are securing against this by limiting styles that can be applied to the :visited pseudoclass to just color, then it serves back the default color if a script ever tries to check.