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Browsers Names
  • Mozilla Firefox
  • Microsoft Internet Explorer
  • Google Chrome
  • Apple Safari
  • Opera
Important Concepts
  • Same Origin Policy
    • The policy permits scripts running on pages originating from the same site to access each other's methods and properties with no specific restrictions, but prevents access to most methods and properties across pages on different sites.
    • An important extension to the same origin policy implemented for JavaScript DOM access (but not for most of the other flavors of same-origin checks) is that two sites sharing a common top-level domain may opt to communicate despite failing the "same host" check by mutuallysetting their respective document.domain DOM property to the same qualified, right-hand fragment of their current host name.
    • The following are not subjected to same-origin checks:
      • Remote SCRIPTs
      • submit POST forms
      • Simple Multimedia markup like IMG, BGSOUND tag
      • Remote stylesheets
      • Embedded objects
      • Embedded applets
      • FRAME
      • IFRAME
    • The following are subjected to same-origin checks:
      • DOM access
      • XMLHttpRequest
    • The following can load any URL
      • Link targets
      • Refresh and Location directives
      • JavaScript DOM access
      • Form submission

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