Riot brings custom tags to all browsers, including IE8. Think React + Polymer but with enjoyable syntax and a small learning curve.

<timer>

  <p>Seconds Elapsed: { time }</p>

  this.time = opts.start || 0

  tick() {
    this.update({ time: ++this.time })
  }

  var timer = setInterval(this.tick, 1000)

  this.on('unmount', function() {
    clearInterval(timer)
  })

</timer>

riot.mount('timer', { start: 0 })

Custom tags lets you build complex views with HTML.

<timetable>
  <timer start="0"></timer>
  <timer start="10"></timer>
  <timer start="20"></timer>
</timetable>

HTML syntax is the de facto language on the web and it's designed for building user interfaces. The syntax is explicit, nesting is inherent to the language and attributes offer a clean way to provide options for custom tags.

• Absolutely the smallest possible amount of DOM updates and reflows.
• One way data flow: updates and unmounts are propagated downwards from parent to children.
• Expressions are pre-compiled and cached for high performance.
• Lifecycle events for more control.

• No proprietary event system.
• Event normalization for IE8.
• The rendered DOM can be freely manipulated with other tools.
• No extra HTML root elements or data- attributes.
• Plays well with jQuery.

• Create tags with CoffeeScript, Jade, LiveScript, Typescript, ES6 or any pre-processor you want.
• Integrate with NPM, CommonJS, AMD, Bower or Component
• Develop with Gulp, Grunt or Browserify plugins

• Power shortcuts: class={ enabled: is_enabled, hidden: hasErrors() }.
• No extra brain load such as render, state, constructor or shouldComponentUpdate
• Interpolation: Add #{ items.length + 1 } or class="item { selected: flag }"
• Compact ES6 method syntax.

• Riot Todo MVC
• Hackernews reader
• Vuejs examples by Riotjs
• Flux-like ES6 Todo
• Simple TODO
• Timer
• Flux- like event controller for Riot
• Another flux demo caparable to React ones
• Various experiments
• Isomorphic application
• flux-riot todo

• Building Apps with Riot, ES6 and Webpack
• Building Apps with Riot, Babel and Browserify
• Building tabs with Riot
• The "React tutorial" for Riot
• How to package "tag libraries" in Riot
• Another React tutorial with Riot
• Riot Custom Tag by Example
• Riot Compiler Explained
• Adding compiled Riot tags to your Gulp + Browserify build

• Riot + Angular
• Module loader for WebPack
• Riot module for AngularJS
• Riot + Meteor
• Riot on CodeClimate
• Riot Snake Game
• flux-riot framework

https://muut.com/riotjs/