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HTML was designed in a time when the browser was a simple document viewer. Developers building great web apps need something more.

Instead of trying to replace HTML, however, Ember.js embraces it, then adds powerful new features that modernize it for building web apps.

Currently, you are limited to the tags that are created for you by the W3C. Wouldn't it be great if you could define your own, application-specific HTML tags, then implement their behavior using JavaScript?

That's exactly what components let you do. In fact, it's such a good idea that the W3C is currently working on the Custom Elements spec.

Ember's implementation of components hews as closely to the Web Components specification as possible. Once Custom Elements are widely available in browsers, you should be able to easily migrate your Ember components to the W3C standard and have them be usable by other frameworks.

This is so important to us that we are working closely with the standards bodies to ensure our implementation of components matches the roadmap of the web platform.

To highlight the power of components, here is a short example of turning a blog post into a reusable blog-post custom element that you could use again and again in your application. Keep reading this section for more details on building components.

   {{#blog-post title=title}}
<article class="blog-post">
  <p>Edit title: {{input type="text" value=title}}</p>
var posts = [{
  title: "Rails is omakase",
  body: "There are lots of à la carte software environments in this world."
  }, {
    title: "Broken Promises",
    body: "James Coglan wrote a lengthy article about Promises in node.js."

export default Ember.Route.extend({
  model: function() {
    return posts;
export default Ember.Component.extend({