Specification: https://html.spec.whatwg.org/multipage/scripting.html
Multipage: https://html.spec.whatwg.org/multipage/#drawing-paths-to-the-canvas:dom-context-2d-fill
Complete: https://html.spec.whatwg.org/#drawing-paths-to-the-canvas:dom-context-2d-fill
Referrer: https://html.spec.whatwg.org/multipage/scripting.html

Comment:
It's not clear from the spec if two paths which describe two poligons with a
common edge, when render as a single solid polygon when using fill() on them.
In particular the spec does not seem to explain what implementation of
anti-aliasing should be used on edges, to make sure that there is no gap
between incident shapes.
For example http://jsfiddle.net/xgd03fyb/ in Chrome shows two triangles with a
visible artifact between them, while clearly the intention was to draw them as
a square. Is it a bug or a feature?

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