CSS/SVG Rounded corners for multiple browsers

Here’s a demo of a div with a simple 10px radius 1px border that works in Opera 9.5, Firefox 2+ and Safari 3 beta. It uses -moz-border-radius for Firefox, -webkit-border-radius for Safari and an SVG background for Opera 9.5. The SVG file this time is actually a modified version of a new method Holger Will came up with.

Of course, it doesn’t work quite that easily. The CSS3 corner method uses a border, but for Opera we don’t want that border to appear because it already exists in the SVG file. Additionally, we’ll have to change the position and padding slightly so the border appears in the exact same place.

One way to solve the problem would be javascript browser-sniffing, but that’s an “evil” solution, and I’d like to avoid using javascript if at all possible. Instead, I used O9.5’s :nth-child() pseudo-selector with a value of 1n to target every instance. Other browsers (except Konqueror) don’t support this (yet), so until they do, this method should work.

So obviously this is just a temporary solution until either Opera supports rounded corners, other browsers support SVG backgrounds, or other browsers support the selectors that Opera does (which would break my “hack”).

Oh, and to allow support in IE, I’d recommend a javascript trick (there are several out there) inside a conditional comment tag. It may also be possible to use VML to achieve a similar effect as the SVG background, but I’m not sure.