I really appreciate that an SPA can function more as an offline application, not just a website. I wish that there were a standard endorsed beyond just the manifest.json though... I wish there were a .{someExtensionThatIsReallyZip} package that contained a manifest.json, as well as all other files that package needed... this is how chrome extensions are, but it would be nice to see a standard model for apps supported by more browsers for this.
For all the things I didn't/don't care for regarding flash and silverlight, having a single compressed downloadable package is a nicety. I think Silverlight did a better job of it though. When Adobe bought Macromedia, my sincere hope was that they'd turn flash into a more open format that was an archive manifest with svg, mp3 and other assets with closer to plain JavaScript for their part. That could have been something browsers would be more likely to have embraced.
For all the things I didn't/don't care for regarding flash and silverlight, having a single compressed downloadable package is a nicety. I think Silverlight did a better job of it though. When Adobe bought Macromedia, my sincere hope was that they'd turn flash into a more open format that was an archive manifest with svg, mp3 and other assets with closer to plain JavaScript for their part. That could have been something browsers would be more likely to have embraced.