You do not need to use a PIXI Stage any more

[playground]

Try to run demo pages and getting the following errors:

htmlgl.js:21979 You do not need to use a PIXI Stage any more, you can simply render any container.
htmlgl.js:21995 DisplayObjectContainer has been shortened to Container, please use Container from now on.
htmlgl.js:21776
Pixi.js 3.0.10 - ✰ WebGL ✰ http://www.pixijs.com/ ♥♥♥

htmlgl.js:37806 2
pixi.js:21933You do not need to use a PIXI Stage any more, you can simply render any container.
pixi.js:21949DisplayObjectContainer has been shortened to Container, please use Container from now on.
pixi.js:21730
Pixi.js 3.0.10 - ✰ WebGL ✰ http://www.pixijs.com/ ♥♥♥

gl-context.js:74 2
gl-element.js:287 Uncaught NotSupportedError: Failed to execute 'registerElement' on 'Document': Registration failed for type 'html-gl'. A type with that name is already registered.