Recommended property to use for this:

Modernizr.svgasimg

Should also test for svg as css background image.

kroc, i asked a few people and no one has any idea how to do write such a test. :)

you got any ideas?

here is the meat of the test:

http://www.broken-links.com/2010/09/22/using-svg-in-css-with-javascript-detection/

I implemented the following in a recent project, it works great but requires jQuery:

$('<img />')
    .load(function() { Modernizr.addTest('svgasimg', function() { return true; }); })
    .error(function() { Modernizr.addTest('svgasimg', function() { return false; }); })
    .attr('src', 'data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiIHN0YW5kYWxvbmU9Im5vIj8%2BPHN2ZyB4bWxuczpyZGY9Imh0dHA6Ly93d3cudzMub3JnLzE5OTkvMDIvMjItcmRmLXN5bnRheC1ucyMiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgaGVpZ2h0PSIxIiB3aWR0aD0iMSIgdmVyc2lvbj0iMS4xIj48cmVjdCBoZWlnaHQ9IjEiIHdpZHRoPSIxIiB5PSIwIiB4PSIwIiBmaWxsPSIjMDAwIi8%2BPC9zdmc%2B');

The script I used in my post on Broken Links doesn't seem to work in Opera; I haven't had an opportunity to look into it yet, but you might want to confirm.

Unfortunately his test fails in Opera due to a known bug with onload for SVGs. DSK-276385 in their BTS, for reference.

Could possibly be temporarily worked around using canvas getImageData I think, though there might be x-domain restrictions there - Modernizr probably couldn't be remote.