2.1.2 [W3C-CANVAS2D] Section 3 Line styles

V0009: The lineCap and lineJoin attributes accept invalid values and try to use them

The specification states:

 3 Line styles
 ...
 The lineCap attribute defines the type of endings that UAs will place on the end of 
 lines. The three valid values are "butt", "round", and "square".
 ....
 The lineJoin attribute defines the type of corners that UAs will place where two lines 
 meet. The three valid values are "bevel", "round", and "miter".

All document modes (All versions)

The lineCap and lineJoin attributes accept invalid values and try to use them.