Html web color codes and chart, how to get hexadecimal values

It happens very often when you need to get hexadecimal values for colors so you can set them as background color or color of a certain text in CSS style without opening Photoshop or other software. So I think that a useful link is this one http://html-color-codes.info/. I wrote this link because it was useful to me. It is not because of advertising reasons. :)