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What's an example of this?

• andrewmcwatters 6y ago
  Signing into a website through an iframe redirects you back to a sign in page inexplicably if the post-signin page requires a cookie. Another example is you're signed into website A, and while on website B, iframes to website A behave in such a way that you're not signed in, and you cannot sign in.
• michaelt 6y ago
  If you disable third-party cookies, you can't download files or view videos in Google Drive without a workaround. This is because the download is from googleusercontent.com while your browser remains at drive.google.com the whole time - and to download private files, googleusercontent.com expects you to have a login cookie. If you block third-party cookies the download gets stuck in a redirect loop, sending you to get a cookie over and over again. Google is aware of this but hasn't fixed it.