- The integration of XHTML and SMIL allows to write valid XHTML code.

- Timing, animation, transition can be added to the web pages.

- The layout functionality is provided by XHTML / CSS

- The linking module functionality is provided by XHTML

- The XHTML is the host language for providing structure module for SMIL.

- Meta information is also available with XHTML.

- The above modules are integrated by XHTML in SMIL.