This is my solution - is taking around 6ms and I'm considering WebP is only a feature for a modern browser. Uses a different approach using canvas.toDataUrl() function instead of image as the way to detect the feature:
function support_format_webp()
{
var elem = document.createElement('canvas');
if (!!(elem.getContext && elem.getContext('2d')))
{
// was able or not to get WebP representation
return elem.toDataURL('image/webp').indexOf('data:image/webp') == 0;
}
else
{
// very old browser like IE 8, canvas not supported
return false;
}
}
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