Asaf Zamir – Chief Technology Officer & AI/Cloud Consultant. Founder of CloudExpat, AZdev. Author of Coder to CTO.

Until recently whenever I had to do the simplest animation I always had to use JavaScript code.
If you're using jQuery it's pretty easy to make simple effects.
The most known ones would probably be slideDown() and slideUp().
Custom animation is also pretty easy with jQuery:

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$('div.red').hover(function() {
    $('div.red').animate({
    width: '+=50',
    height: '+=50'
    }, 200)
},
function() {
    $('div.red').animate({
        width: '-=50',
        height: '-=50'
    }, 200)
});

Local Storage (or Web Storage), is a simple yet very powerful feature of HTML5, that is pretty much supported across the board
by now, as in, by almost all browsers.
In essence, Local Storage lets you store information for a long period of time (more on that in a bit).
This has many uses, especially for Web Apps.

FastBook is an interesting project made by Sencha
to basically prove that Facebook’s switch to Native applications on Android
might have not been the right way to go.