noindex for part of content in a webpage

This is experiment on how class="robots-nocontent" works. All my previous three experiments class="robots-noindex", rel="noindex", <noindex> failed in making a part of the content non indexable by search engines. Lets try this finally.

<div class="robots-nocontent">As yahoo told at http://help.yahoo.com/l/us/yahoo/search/webcrawler/slurp-14.html, this part of content in this div shouldn't indexed by yahoo search engine. But not sure about Google. Google may not support this "robots-nocontent" class. Because it is quite opposite to Google SEO philosophy, "do no do anything specially for search engines" </div>

Let's see what happens.