Liorean's PNG versus JPEG & GIF test
After reading through the PNG specification I decided to test how good the support in the newest version of the best browsers are. Here's a summary of my results.
Img tag: Imp.
Input tag: Imp.
Object tag: Imp.
Background: Imp.
Full transparency: Imp.
Alpha support: Imp.
Img tag: Imp.
Input tag: Imp.
Object tag: Not imp.
Background: Imp.
Full transparency: Imp.
Alpha support: Depending on image type — Not at all for true colour images. Alpha rendered as completely transparent for palette images.