Which is also why publishers will soon realize they can’t serve stuff in chunks where the reader can opt out of downloading or rendering certain parts.
I thinking canvas+wasm and similar tech will soon be used in a second coming of flash - where a full site will be downloaded as a blob and rendered by site code.
The code used by ads would still need to be hosted on third parties servers, because ad servers can't trust sites owners to host the ad code because of cheating. So blocking advertisers hosts could still work even if ads use canvas and wasm.
I think the idea of downloading ads (code) directly from third parties will die sooner than this “Flash 2” becomes an issue. That just isn’t sustainable regardless of the trust issue (a person described his ad network that doesn’t rely on third party served code in another comment).
But if blocking advertisers’ hosts is working, it’s trivial for publishers to simply present nothing if the ad isn’t successfully downloaded. When the rendering is controlled by the third party, it’s an all or nothing affair.
