A featured WebmasterWorld thread has one webmaster who said his 13 year old well ranking web site was updated to use the latest CSS and coding techniques. The page content, titles, meta information was not touched, only the way the page renders, by using the latest CSS techniques to reduce page load time and page redenering. He said, immediately after the site went live, his rankings for keywords he ranked well for since the site was first launched 13 years ago – have vanished.

Let me quote what he said:

He posted that on June 27th and today, two weeks later, there has been no improvement.

Now, if the URLs, title, content and everything else stayed the same and the only thing you updated was how the page source code is implemented, a ranking change should not been seen. I have to suspect that this webmaster is missing something, but he is confident he is not.

Tedster, WebmasterWorld’s administrator said:

Have you experienced this? I just find it hard to believe that there are not other factors involved here.

Forum discussion at WebmasterWorld.