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Reported by Anton Prowse (A) 9.5.2 ('clear') says: # Clearance inhibits margin collapsing [...] s/margin collapsing/certain margin collapsing behaviour/ since the interaction of clearance with margin collapsing is more complex than the phrase implies. (B) 9.5.2 ('clear') says: # If this hypothetical position of the element's top border edge # is not past the relevant floats, then clearance is introduced, # and margins collapse according to the rules in 8.3.1. s/margins collapse/margins collapse anew/ since margins collapsed in the calculation of the hypothetical position, albeit under different (temporary) conditions