Div position fixed on the top of web page

Question

How to make a div to always appear at the top of a web page even when the paged is scrolled vertically.

Answer 1

Use CSS position: fixed;:

#topdiv {
    position: fixed;
    top: 0;
}

See jsFiddle example: http://jsfiddle.net/CXACT/1/

Answer 2

div#myDiv {position: fixed; top: 0px; ...}