Testcase for Bug #91665.
This testcase checks if an element is properly placed with respect to its previous sibling when its position changes from static to absolute for various combinations of display property, toggeled between inline-block and block for both testElement and its previous sibling.

Case 1: <Block Element><Block Element> To <Block Element><Positioned Block Element>

Case 2: <Block Element><Block Element> To <Block Element><Positioned Inline Element>

Case 3: <Block Element><Block Element> To <Inline Element><Positioned Block Element>

Case 4: <Block Element><Block Element> To <Inline Element><Positioned Inline Element>

Case 5: <Block Element><Inline Element> To <Block Element><Positioned Block Element>

Case 6: <Block Element><Block Element> To <Inline Element><Positioned Block Element>

Case 7: <Block Element><Inline Element> To <Inline Element><Positioned Inline Element>

Case 8: <Inline Element><Block Element> To <Block Element><Positioned Inline Element>

Case 9: <Inline Element><Block Element> To <Inline Element><Positioned Block Element>

Case 10: <Inline Element><Block Element> To <Inline Element><Positioned Inline Element>

Case 11: <Inline Element><Block Element> To <Block Element><Positioned Inline Element>

Case 12: <Inline Element><Inline Element> To <Inline Element><Positioned Block Element>

Case 13: <Inline Element><Inline Element> To <Inline Element><Positioned Inline Element>

Case 14: <Block Element><Table Element> To <Block Element><Positioned Table Element>

Case 15: <Block Element><Table Element> To <Block Element><Positioned Inline-Table Element>

Case 16: <Block Element><Table Element> To <Inline Element><Positioned Table Element>

Case 17: <Block Element><Table Element> To <Inline Element><Positioned Inline-Table Element>

Case 18: <Block Element><Inline-Table Element> To <Block Element><Positioned Inline-Table Element>

Case 19: <Block Element><Inline Element> To <Block Element><Positioned Table Element>

Case 20: <Block Element><Inline-Table Element> To <Inline Element><Positioned Inline-Table Element>

Case 21: <Inline Element><Table Element> To <Inline Element><Positioned Inline-Table Element>

Case 22: <Inline Element><Table Element> To <Inline Element><Positioned Table Element>

Case 23: <Inline Element><Block Element> To <Inline Element><Positioned Inline-Table Element>

Case 24: <Inline Element><Inline-Table Element> To <Block Element><Positioned Inline-Table Element>

Case 25: <Inline Element><Inline-Table Element> To <Inline Element><Positioned Table Element>

Case 26: <Inline Element><Inline-Table Element> To <Inline Element><Positioned Inline-Table Element>