Cross-domain Communications with Iframes by Michael Mahemoff

June 22, 2009
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Just came across an excellent article by Michael Mahemoff on cross-domain communications using iframes.

Michael Mahemoff has given a very good summary on “the 4 laws of iframe communications“:

  1. Law I: Any window in the hierarchy can get a handle to any other window in the hierarchy.
  2. Law II: Windows can only access each others’ internal state if they belong to the same domain.
  3. Law III: Any window in the hierarchy can set (but not read) any other window’s location/URL, even though (from Law II) browser security policies prevent different-domain iframes from accessing each other’s internal state.
  4. Law IV: When you change the URL’s fragment identifier (the bit on the end starting with a #, e.g. http://example.com/blah#fragmentID), the page doesn’t reload.

You can read the full article here:
Cross-domain Communications with Iframes

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