But that's not, what this thread is about. Beneath the other suggestions of this thread, the suggestion for search-fields doesn't mean only the optics of a search-field, but to have an option (an additional parameter or something like that), so that the webdesigner can use search-suggestions (like is known from Google, Wikipedia, and many other sites) without scripting!!
That would not only be nice for webdesigners, that are not familiar with scripting (and the goal of HTML was, that many people can share information, not only programmers). But it would also be nice for users that have deactivated scripting (e.g. for security) or even can't change the settings (school, university, work, and so on). Search-suggestions are such a handy and basic function of websites, this should be possible without scripting.