Are the decimal places in a CSS width respected?

Question

Something I\'ve been wondering for a while whilst doing CSS design.

Are decimal places in CSS widths respected? Or are they rounded?

.percentage {
           


        

Answer 1

The width will be rounded to an integer number of pixels.

I don't know if every browser will round it the same way though. They all seem to have a different strategy when rounding sub-pixel percentages. If you're interested in the details of sub-pixel rounding in different browsers, there's an excellent article on ElastiCSS.

edit: I tested @Skilldrick's demo in some browsers for the sake of curiosity. When using fractional pixel values (not percentages, they work as suggested in the article I linked) IE9p7 and FF4b7 seem to round to the nearest pixel, while Opera 11b, Chrome 9.0.587.0 and Safari 5.0.3 truncate the decimal places. Not that I hoped that they had something in common after all...