CSS Clip Attribute - clip:rect(top,right,bottom,left)

A 100x100 div block with clip:rect(0,100,100,0);

A 100x100 div block with clip:rect(50,100,100,0);

A 100x100 div block with clip:rect(0,100,100,50);

A 100x100 div block with clip:rect(0,50,100,0);