(1) The webmaster inserts the AdSense JavaScript code into a webpage."
So this is the webmaster modifying his own page. It's not Google injecting Javascript into someone else's page like CMA Communications or Comcast is said to be doing.
(1) The webmaster inserts the AdSense JavaScript code into a webpage."
So this is the webmaster modifying his own page. It's not Google injecting Javascript into someone else's page like CMA Communications or Comcast is said to be doing.