some pain point for building podcast over pwa.
1. DOMParser from SW
sw can't access to DOM API it includes DOMParser API too. so it neccessary for import extra xml feed parser in sw. it reasonable for me that sw can't access to window dom tree but if DOMParser is indepened from tree, I wish I can use them.
in my case, I serve feed xml by myself, so I export json version of feed.