Method and system for managing development objects for computer program code. One development object comprises source code written in a positional language while the other development object comprises a document object model (DOM) that corresponds to the source code. The two development objects are synchronized using a set of synchronizer objects. In particular, the various character ranges defined by the positional language are used to efficiently map a portion of the source code to a corresponding portion of the DOM. As a result, a synchronizer object can readily update a development object with a modification received for the other development object.