Yeah and on mobile devices you can waste a lot more battery running animations in HTML5. I'm sure your users will appreciate that. Surely the most important thing is to optimize programmer time and comfort without regard to the end-user experience and that thinking has lead to a world filled with wonderful well-designed software that properly handles error conditions and never presents users with useless choices or non-actionable obscure error messages.*

Snark aside, if you have a native mobile app it is a much, much nicer experience to have native animations integrated rather than trying to mash an HTML view into the app just for some animations.

*Because programmers are the worst kind of pedants: Yes I know sometimes you can't afford to write native apps, sometimes a partial solution is better than no solution, etc. Just don't lie and tell me a web app is as good as (or better than) a native app, or that Cordova is a great way to write mobile apps. Those are compromises. Sometimes you make compromises to get shit done. It doesn't magically transform a compromise into an ideal solution.

> Keyframes is just after effects animation in HTML5, a feature that could be implemented more natively using svg and a solution similar to this for older browsers

That's another approach which has it's own pros and cons. The approach from the article is obviously good if you have Affect Effects experts on hand. I'm not understanding why this isn't interesting to programmers who on a daily basis have to weigh up the pros and cons of different technology/library choices.