16033 2012-02-20 16:08:59 +0000 Stacking contexts: incorrect edit made to 9.9.1 2012-12-04 00:54:50 +0000 1 1 1 Unclassified CSS CSS Level 2 unspecified All Windows 3.1 NEW P2 normal --- 1 antonsforums bert public-css-bugzilla oldest_to_newest 64305 0 antonsforums 2012-02-20 16:08:59 +0000 As part of the edits made in the move from WD (http://www.w3.org/TR/2010/WD-CSS2-20101207/visuren.html#z-index) to PR (http://www.w3.org/TR/2011/PR-CSS2-20110412/visuren.html#z-index), an error was introduced in 9.9.1. The following WD text: # Positioned elements with 'z-index: auto' (in layer 6), floats # (layer 4), inline blocks (layer 5), and inline tables (layer 5), # are painted as if those elements generated new stacking contexts, # except that their positioned descendants and any child stacking # contexts take part in the current stacking context. was changed in the PR to: # <ins>Within each stacking context,</ins> positioned elements with # stack level 0 (in layer 6), non-positioned floats (layer 4), # inline blocks (layer 5), and inline tables (layer 5), are painted # as if those elements <ins>themselves</ins> generated new stacking # contexts, except that their positioned descendants and any # <ins>would-be</ins> child stacking contexts take part in the # current stacking context. Note that, apart from the three indicated edits that were discussed on the mailing list [http://lists.w3.org/Archives/Public/www-style/2011Mar/0108.html], there was also a change from "positioned elements with 'z-index: auto'" to "positioned elements with stack level 0". This change was not discussed, to my knowledge. Unfortunately it is incorrect, since positioned elements with stack level 0 include positioned elements with 'z-index: 0', and these latter elements /don't/ have the described "almost stacking context" behaviour. (Rather, they have full stacking context behaviour.) 64306 1 antonsforums 2012-02-20 16:11:08 +0000 Proposal: Replace: # Within each stacking context, positioned elements with stack # level 0 (in layer 6), [...] with: | Within each stacking context, positioned elements with | 'z-index: auto' (in layer 6), [...]