Testcase for Bug #91665.
This testcase checks if an element is properly placed with respect to its previous sibling when float:left changes to float:none for various combinations of display property toggeled between inline-block and block for both testElement and its previous sibling.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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