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Reported by Simon Sapin 10.6.5 ([Height, margins etc. of] absolutely positioned, replaced elements) provides a sequence of substitutions to ensure good used values of 'height', 'margin-top', 'margin-bottom', 'top' and 'bottom'. However, it fails to cover the case of an absolutely positioned, replaced element with an auto value for 'top' and 'margin-top' and a non-auto value for 'bottom' and 'margin-bottom'. Conversation begins: Bug description: http://lists.w3.org/Archives/Public/www-style/2012May/0947.html
Proposal by Simon Sapin: In step 3, replace: # If 'bottom' is 'auto', replace any 'auto' on 'margin-top' # or 'margin-bottom' with '0'. with: | "If 'top' or 'bottom' is 'auto'", replace any 'auto' on | 'margin-top' or 'margin-bottom' with '0'. Note that this is analogous to Step 3 in 10.3.8. Proposal: http://lists.w3.org/Archives/Public/www-style/2012May/0947.html