In theory, but looking across browsers shows that you'd never be able to use this in production without falling back to graphics, which adds to production, main

In theory, but looking across browsers shows that you'd never be able to use this in production without falling back to graphics, which adds to production, maintenance and degrades any performance benefits for a good portion of users. It's a nice theoretical challenge, and may provide some benefits if you are building (mobile) device specific systems, but as a broad technique there is little production value at the moment.