Simon Brunel f7d2d7536a Fix failing instanceof when reading context
`instanceof HTMLCanvasElement/CanvasRenderingContext2D` fails when the item is inside an iframe or when running in a protected environment. We could guess the types from their toString() value but let's keep things flexible and assume it's a sufficient condition if the item has a context2D which has item as `canvas`.
2017-04-22 13:14:16 -04:00
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