crobb305 - 8:40 pm on Apr 13, 2011 (gmt 0)
Google has been using visual page simulation for a while - their "reasonable surfer" model leans on it, and it has modified the way PageRank is calculated.
Last year someone had a penalty reversed because an iframe generated a false positive for their "too much white space" metric. It was documented on Google's own forum, and JohnMu got involved to place a flag on the site, in case it ever triggered that penalty again.
I have been looking around for more information about this case, but haven't been able to. I'm sure I will eventually find it, but I wanted to ask you if this was only about visible white space, or does messy html with a lot of breaks in the code (looks like excessive whitespace in the html) or inflated html/text ratios cause this also? I have read that the optimal html to text ratio is 42, but I have a page hard hit by Panda sitting at 60% (the highest on my site). That can't be good. Not saying that's the cause of its Pandalization, but it's definitely worth cleaning up. I do see A LOT of messy code on my site, whereas some well-ranking sites (including another one of mine) have cleaner code with fewer line breaks in the html.