2.1.4 [W3C-CANVAS2D] Section 8 Fill and stroke styles

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V0013: The fillStyle attribute allows invalid values

The specification states:

 8 Fill and stroke styles
 ...
 The fillStyle attribute represents the color or style to use inside shapes, and the 
 strokeStyle attribute represents the color or style to use for the lines around the 
 shapes.
  
 Both attributes can be either strings, CanvasGradients, or CanvasPatterns. On setting, 
 strings must be parsed as CSS <color> values and the color assigned, and CanvasGradient 
 and CanvasPattern objects must be assigned themselves [CSSCOLOR]. ...

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The fillStyle attribute allows invalid values and parses them and maps them to valid values.