https://crbug.com/1445937 We need to see a 100x100 orange square, not a 400x25 orange rectangle.

https://crbug.com/1454306 The boxes each must be 1/4 the size of the yellow containing block. No overflow.

https://bugs.chromium.org/p/chromium/issues/detail?id=1457103 We need a 100x100 green square here.