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video.js/docs/guides/components.md

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Components
===
The Video.js player is built on top of a simple, custom UI components architecture. The player class and all control classes inherit from the `Component` class, or a subclass of `Component`.
```js
videojs.registerComponent('Control', videojs.extends(Component));
videojs.registerComponent('Button', videojs.extends(videojs.getComponent('Control')));
videojs.registerComponent('PlayToggle', videojs.extends(videojs.getComponent('Button')));
```
The UI component architecture makes it easier to add child components to a parent component and build up an entire user interface, like the controls for the Video.js player.
```js
// Adding a new control to the player
myPlayer.addChild('BigPlayButton');
```
Every component has an associated DOM element, and when you add a child component, it inserts the element of that child into the element of the parent.
```js
myPlayer.addChild('BigPlayButton');
```
Results in:
```html
<!-- Player Element -->
<div class="video-js">
<!-- BigPlayButton Element -->
<div class="vjs-big-play-button"></div>
</div>
```
The actual default component structure of the Video.js player looks something like this:
```
Player
PosterImage
TextTrackDisplay
LoadingSpinner
BigPlayButton
ControlBar
PlayToggle
FullscreenToggle
CurrentTimeDisplay
TimeDivider
DurationDisplay
RemainingTimeDisplay
ProgressControl
SeekBar
LoadProgressBar
PlayProgressBar
SeekHandle
VolumeControl
VolumeBar
VolumeLevel
VolumeHandle
MuteToggle
```