Building a website should be in accordance with the specifications as given by the World Wide Web Consortium or W3C. As of the latest the W3C is using XHTML 1.0 as the standard lingua franca of the web, which means that the rules incorporated within XHTML 1.0 must strictly be followed by website designers and website developers. That is why there was a wide spread transition from HTML to XHTML when W3C approved the use of the latter as the standard. Many of the tags that were used in the website design process using HTML were already considered to be deprecated which means that it is outdated or obsolete and should not be used anymore. Since many new web browsers nowadays if not all web browsers conform to the standards set by W3C the codes that were deprecated will now become an error when the web page is displayed.
In order to avoid this types of problems in the future it is the duty of the website designer and web developer to constantly update the code of their website in order to conform to the latest standards that is being set by the W3C. Now talks about changing the standard XHTML 1.0 to HTML 5 is ongoing and there are a lot of new elements that will be incorporated should the HTML 5 version is going to be finally approved by the W3C. Thus it is imperative that you have to prepare for this yet again change in standards. So how can one prepare? First you have to check your codes if it still has remnants of the older version of HTML if so you have to patch or fix this by changing it with the most appropriate tag or if it is a presentation tag then change it to a CSS code. In addition, you have to bear in mind the different rules in XHTML so that you will be able to see if your website is strictly following the set rules. Why is this important? This is because of the fact that such rules were created in order to make the website design process to be orderly and to conform to the set standards which is highly likely that will also be adapted by the next standard version if not with only minor changes or modifications. Finally constantly read the technical reports that is being released by the W3C to the public through their website to keep you informed on the latest regarding HTML 5.