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Epub can do all sort of homecalling / user tracking using HTML or CSS or javascript. What's even worse - almost all Epub readers don't do proper sandboxing.

• Tagbert 5y ago
  That is one more reason why it should be supported in browsers where we have better understood ways to control this.
  • hoophoop 5y ago
    Browsers don't block any homecalling either.
• deleted 5y ago
  [deleted]