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My guess is they don't want to send all the cookies stored on the google.com domain whenever someone loads a font.

• ggrot 16y ago
  Seems reasonable. It protects users too because they can't track the cookies across these domains even if they wanted to.
• revicon 16y ago
  Yahoo does this as well for the same cookie reason. Lots of stuff is hosted on yahoo.net that's considered potentially unsafe.