Input hints used to require scripting, but in HTML5 they may be easily specified via the placeholder attribute.

With the correct JQuery code, autocomplete options can be added to text boxes.

JQuery code can also add a date picker to a text box.

Tooltips can be added to any element. With the appropriate code, the contents of the title attribute will show up in a tooltip

Sliders are valid form elements as of HTML5.

Sliders can also be created through JQuery scripting. Here are some examples.