9. A computer program product comprising a tangible storage device embodying computer program logic, said computer program product comprising: code for providing a web page editor comprising a graphical user interface; code for parsing a web page being edited using the web page editor; code for extracting computed and declared styles of an element present in the web page being edited; code for identifying a combination of markup structure and style sheet property of the web page being edited, wherein the combination causes a rendering issue associated with a web browser when the web page is rendered by the web browser even with the markup structure and style sheet property supported by the web browser and specified using correct syntax; and code for presenting information about the rendering issue in the graphical user interface of the web page editor while the web page is being edited.
9. A computer program product comprising a tangible storage device embodying computer program logic, said computer program product comprising: code for providing a web page editor comprising a graphical user interface; code for parsing a web page being edited using the web page editor; code for extracting computed and declared styles of an element present in the web page being edited; code for identifying a combination of markup structure and style sheet property of the web page being edited, wherein the combination causes a rendering issue associated with a web browser when the web page is rendered by the web browser even with the markup structure and style sheet property supported by the web browser and specified using correct syntax; and code for presenting information about the rendering issue in the graphical user interface of the web page editor while the web page is being edited. 10. The computer program product claim 9 , further comprising: code for retrieving the information about the rendering issue from a remote database.