I applied \"border-bottom:#F60 dotted .3em;\" to a div and while Firefox renders the dots as round, Chrome shows them as blocky dashes. Any takers?
If it's important that the borders are the same you can look into the CSS3 border image property: http://www.css3.info/preview/border-image/ for Chrome it will be -webkit-border-image:
-webkit-border-image: