The claimed method and system provides programmers of client-server applications the ability to implement extensions to a standard style sheet language by using a preprocessor at a client to first parse, extract, and transform noncompliant, proprietary code. A new standards compliant style sheet may be created based on the transformed noncompliant code. This style sheet may then be executed on a client browser. The claimed system may be used to conform a client application schema with a client operating system schema.