Multi-resolution (HTML5 or not) games.

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How to conform your game content to the available screen space ?
How to appropriately handle retina display resources ?
How to deal with the million different screen resolutions available and have your game gracefully up/down scale ?

This post describes how this problem is Addressed in Cocos2d-html5 V4, the API available for this purpose and how to handle special cases like orientation change requests.