Simon Brunel 4a5b5a0e7e Enhance context acquisition on chart creation
Add support for creating a chart from the canvas id and prevent exceptions, at construction time, when the given item doesn't provide a valid CanvasRenderingContext2D or when the getContext API is not accessible (e.g. undefined by add-ons to prevent fingerprinting). New jasmine matcher to verify chart validity.
2016-10-16 08:25:13 -05:00
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