Highlight and ignore tag using AdSense

When using AdSense and dynamic generated content, like password and sentence generator you don't want google Adesense to index the generated content. Then you can ad a comment tag in your code to give AdSense a hint on what you want and not want to consider as your valid content. This is only used to find relevant ads, not for google search engine, as far as I know.

Highlight content:

Ignore content:

Source: https://www.google.com/adsense/support/bin/answer.py?hl=en&answer=23168