>Web browser vendors have been reluctant to implement it because of increases attack surface Which isn't a very convincing argument when they are quite happy t

>Web browser vendors have been reluctant to implement it because of increases attack surface Which isn't a very convincing argument when they are quite happy to implement dozens of other things that vastly increase the attack surface of browsers but have far lower practical impact on the average web page. Imagine how much bandwidth has been wasted over the last 10 years because the web didn't have a lossy image format that supported transparency.