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Precision tests for stroke-linejoin.
The main indication for a failed test is the appearence of something red.
stroke-linejoin is tested, using a comparsion with filled or stroked paths or shapes with the same appearance. This is tested for different three miter angles for the values round, miter and bevel, for each of them one with test path on top of the comparsion shapes and one with the path below.
The four paths top right test the inheritance either for the value explicitely set to 'inherit' or a missing stroke-linejoin property.
The top is always blue. If something red gets visible, an error is occured.