Changes

Gecko uses the Document Object Model (DOM) which provides a set of interfaces (available for both C/C++ and JavaScript) implemented by the NGLayout content model allowing for the insertion, deletion and modification of HTML content. These interfaces can be accessed by programmers via the Cross Platform Component Object Model (XPCOM). XPCOM allows for the modularization of large projects into into smaller manageable pieces called components as well as for the creation of interfaces (IDL's via XPIDL).

The Gecko parser provides the first steps required for the browser to display web pages. Despite being optimized to parse HTML the parser use is not limited to this type of data.