Thanks again for the continued Podcasts!
RE: Picture Tag
One source (Mozilla) says it is experimental, not full endorsed or settled and lacks mobile browser support except for iOS Safari 9.3
Another source says it is standardized and shows how to use it, but also shows that only current browsers support it and again only mobile support is Android browser 47+ and IOS Safari 9.3+
To me, I don’t think basing projects off this is feasible yet until it is more widely adopted, settled on and becomes a bonified standard that works mobile up to desktop fully.