The more libs like this I see, the more I feel that the core HTML controls should be improved and expanded. They are getting really, really dated and don't add

The more libs like this I see, the more I feel that the core HTML controls should be improved and expanded. They are getting really, really dated and don't address a lot of common problems. Things I feel would make a lot of sense: Collapsible trees. Numeric sliders (preferably done like draggable digits http://worrydream.com/Tangle/ http://worrydream.com/Tangle/). Native drag-and-drop sipport for elements. (And yes, this can be done with plain forms. I can explain how if you want.) Native rich tooltips and a standard notation to show that something has a tooltip. Maybe tabs. I think you could do tabs with CSS, but I'm not 100% sure. If most UI libraries have something, it probably would be a good addtion to HTML spec. It would work faster and eventually have better compatibility.