It's also worth noting that <datalist> currently seems to be conceived as a combobox, while search suggestions deserve totally different UI. Opera's UI is suitable to search suggestions, but WebKit's proposed UI is inappropriate for them:
http://docs.google.com/View?id=dch3zh37_0cf8kc8c4 There's a little drop-down arrow you have to click to get the list, which is unexpected for search suggestions. If a separate "suggest" IDL attribute were added, UAs could provide different UI for that and datalist.
