72957 2011-11-22 06:56:57 -0800 :only-of-type pseudo selector breaks :hover on <summary> 2012-02-13 22:37:00 -0800 1 1 1 Unclassified WebKit CSS 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 75930 72352 1 mnissler webkit-unassigned dominicc hyatt mkwst morrita shanestephens shinyak oldest_to_newest 507587 0 116219 mnissler 2011-11-22 06:56:57 -0800 Created attachment 116219 Reduced test case. summary:hover doesn't trigger if the summary element is nested in a div that has a div:only-of-type rule and the details contain another div container. The contents of the div:only-of-type rule are not important, an empty rule triggers the problem. I see this on the nightly at r100982 on Mac and on Chromium (webkit revision r100825). Test case reduction is attached. 512367 1 shanestephens 2011-11-30 19:42:41 -0800 Also see https://bugs.webkit.org/show_bug.cgi?id=73068 which might be related. 527195 2 shinyak 2011-12-26 04:44:33 -0800 I've investigated this issue. Let me try to explain the cause. Actually, :hover is triggered but discarded soon. This is DOM tree of the DETAILS element. DETAILS |-- SUMMARY |-- DIV 1) In DETAILS element's recalcStyle(), DIV's recalcStyle() is called. 2) In DIV's recalcStyle(), currentStyle is NULL but newStyle is not NULL 3) so reattach() will be called in DIV's recalcStyle(). 4) This will make DETAILS's shadow->needsStyleRecalc() true. 5) So DETAILS's recalcShadowTreeStyle is called. It detaches shadow and re-attaches. This schedules SUMMARY's hover timer. 6) Since :only-of-time is specified, when whole DETAILS's style is calculated again 7) Return to (1). You will be able to find that recalcStyle will be triggered many times when mouse cursor is located on DETAILS element. Once DIV is shown, (2) won't happen. 548556 3 shinyak 2012-02-03 01:11:41 -0800 I think this will be fix in r106637. 548564 4 shinyak 2012-02-03 01:26:30 -0800 I confirmed that this is fixed in r106637. 555960 5 morrita 2012-02-13 22:37:00 -0800 (In reply to comment #4) > I confirmed that this is fixed in r106637. closing. 116219 2011-11-22 06:56:57 -0800 2011-11-22 06:56:57 -0800 Reduced test case. details_hover.html text/html 344 mnissler PGh0bWw+CjxoZWFkPgogIDxzdHlsZT4KYm9keSA+IGRpdjpvbmx5LW9mLXR5cGUgewp9CgpzdW1t YXJ5IHsKICBiYWNrZ3JvdW5kLWNvbG9yOiBncmVlbjsKfQoKc3VtbWFyeTpob3ZlciB7CiAgYmFj a2dyb3VuZC1jb2xvcjogcmVkOwp9CiAgPC9zdHlsZT4KPC9oZWFkPgo8Ym9keT4KICA8ZGl2Pgog ICAgPGRldGFpbHM+CiAgICAgIDxzdW1tYXJ5PlNob3VsZCB0dXJuIHJlZCBvbiBob3Zlci4uLjwv c3VtbWFyeT4KICAgICAgPGRpdj4uLi5idXQgb25seSBkb2VzIHNvIG9uY2UgdGhlIGRldGFpbHMg YXJlIHZpc2libGUhPC9kaXY+CiAgICA8L2RldGFpbHM+CiAgPC9kaXY+CjwvYm9keT4KPC9odG1s Pgo=