Not a priority for webapps. In websites, search engines ignoring the common elements that you would use this for, such as navbars, isn't a deal-breaker. When

Not a priority for webapps. In websites, search engines ignoring the common elements that you would use this for, such as navbars, isn't a deal-breaker. When I search Google for keyword FOO, results that have FOO only in the elements common to all web pages are useless results. I'm typically looking for FOO in the content, not in the navigational elements or other common elements.