Original sentence: , the checkerboard turned 90°), per heraldic rules, though ignoring the 70-year old tradition.The first inverted checkerboard was used in 1940 in France
Edited sentence: , the checkerboard turned 90°) to conform to heraldic rules, though ignoring the 70-year old tradition.For this reason white should be placed in the most "dignified" upper left section (hoist canton) of a heraldic design.In heraldry, the color of the charge (in this case the white of the Polish eagle) should take precedence over the color of the shield (red in the case of the Polish coat of arms).The first "inverted" checkerboard was used in 1940 in France.These rules refer to the main color squares, not the thin border which is considered decoration