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hc_staff.html was created by mapping element names in staff.xml to HTML 4.01 tag names. <address> was arbitrarily mapped to <abbr> since the content models were compatible and the first letter was the same. Internet Explorer does not document support for <abbr>. Node.firstChild returns null even when there is character content which results in a large number of hc_characterdata* tests failing for a reason unrelated to the implementation of the CharacterData interface. The attached patch changes all use of <abbr> in the hc_* tests to <acronym> which is supported by IE.
Created attachment 23 [details] Patches changing abbr to acronym in HTML compatible L1 and L2 Core tests