Yes - but I also don't care, because an older browser without JS and without lazy load support can still render the site. Perhaps a bit slower than a modern on

Yes - but I also don't care, because an older browser without JS and without lazy load support can still render the site. Perhaps a bit slower than a modern one that supports the tags, but it's not going to break. Even browsers that don't support picture sets will render things, just slower (as they're not getting optimized files). But at some point, I simply don't care - I don't know, and I don't care, if the site looks right in IE6. It's my personal hobby site, and I'm not going to expend ever-increasing effort for fewer and fewer people. "Site doesn't work with JS disabled" is a problem, and I fixed it. "Site looks weird in a 20 year old browser" is someone else's problem. :)