Okay sure, but I’m pretty certain about 50% of those site have ads on them. Getting rid of Flash was a much bigger issue but Apple forced it through with iOS an

Okay sure, but I’m pretty certain about 50% of those site have ads on them. Getting rid of Flash was a much bigger issue but Apple forced it through with iOS and it immeasurably improved the experience (at least for those platformsand largely for everyone). Removing document.write improves page performance as well as browser engines. Everything document.write involves can and should be done in other ways, putting document.write behind a Site X wants to allow legacy Javascript do you wish to continue? Clicking no and the ads don’t load would not be a terrible situation. Maybe there are other APIs that should be deprecated first but I cannot think of any. Finally I am pretty certain you could write a document.write polyfill, I’ll have a crack at some point I think.