A.
context.shadowColor = 'rgba(200,0,100,0.8)'; context.shadowOffsetX = -20; context.shadowOffsetY = 10; context.shadowBlur = 10; context.fillRect(50, 50, 200, 100);
B.
context.shadowColor = 'rgba(0,200,100,0.8)'; context.shadowOffsetX = -20; context.shadowOffsetY = 10; context.shadowBlur = 10; context.fillRect(50, 50, 200, 100);
C.
context.shadowColor = 'rgba(200,0,100,0.8)'; context.shadowOffsetX = 20; context.shadowOffsetY = 10; context.shadowBlur = 10; context.fillRect(50, 50, 200, 100);
D.
context.shadowColor = 'rgba(200,0,100,0.8)'; context.shadowOffsetX = -20; context.shadowOffsetY = 10; context.shadowBlur = 0; context.fillRect(50, 50, 200, 100);