WebCookes.org uses a number of advanced techniques to capture as many cookie storage methods as possible. At this moment the following web cookie technologies are supported:

  • HTTP cookies set using HTTP Set-Cookie header — using both direct HTTP response analysis as well as full-page rendering with DOM cookie jar check.
  • HTTP cookies set with JavaScript document.cookie property — using full-page rendering with DOM cookie jar check.
  • HTML5 localStorage — using full-page rendering with DOM localStorage check.
  • HTML5 sessionStorage — using full-page rendering with DOM localStorage check.
  • Adobe Flash Local Shared Object (LSO) — using SWF static analysis.
  • Adobe Flash Remote Shared Object (RSO) — using SWF static analysis.
  • Tracking pixels — GIF and PNG images sized 1x1 pixel loaded from third-party domains
  • Social media logins and SDK — code snippets from popular social media (Facebook, Twitter) that tracks users registered with these networks
  • Cookie matching — technique to ensure persistence of unique identifiers assigned to users by advertising companies even if users delete cookies

In addition to these checks WebCookies.org engine performs the following checks:

The Chromium project has a good Technical analysis of client identification mechanisms.

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