- From: Gérard Talbot <www-style@gtalbot.org>
- Date: Sat, 14 Sep 2013 16:09:52 -0400
- To: "Hĺkon Wium Lie" <howcome@opera.com>
- Cc: "W3C www-style mailing list" <www-style@w3.org>
Hĺkon, One issue that I wish would be explicit and clarified in the spec is if margin collapsing can occur between a column-spanning element and blocks in column boxes. If it can occur, then the spec should say so, then define under which conditions along with an example. If it does not occur, then the spec should say so. Here's a test where browsers differ: http://www.gtalbot.org/BrowserBugsSection/CSS3Multi-Columns/Opera/NewTests/multicol-spanning-margin-collapsing-234.xht ( This test is a modified and customized test from Example XX in http://www.w3.org/TR/css3-multicol/#column-span and in Example 22 in http://dev.w3.org/csswg/css-multicol/#column-span ) Firefox 23 does not support column-span: all, so here, I am only taken into consideration IE10, IE11 (preview), Chrome 29.0.1547.65 and Opera 12.16. The issue involves the margin collapsing of the margin-bottom of the h2#column-spanning which is 80px with the margin-top (which is 40px) of the p in first column box. If margin collapsing occurs between those 2 margins, then there should be an 80px (max(80px, 40px)) tall blue area. IE10 and IE11 do that. (Prince9 also does that but it fails to render the margin-top of first p.) If margin collapsing does not occur (because it should not occur) between those 2 margins, then there should be an 120px (80px + 40px) tall blue area. Chrome 29.0.1547.65 and Opera 12.16 do that. If margin collapsing can occur between column-spanning element and blocks in column boxes, then it could be possible to create tests where several blocks' margin-top collapses with a preceding-sibling column-spanning element. If margin collapsing can occur between column-spanning element and blocks in column boxes, then it could be also possible to create tests where several blocks' margin-bottom collapses with a following-sibling column-spanning element. Another sub-issue is: can margin collapsing occur between 2 vertically-adjacent (following sibling) column-spanning elements. Gérard -- CSS 2.1 Test suite RC6, March 23rd 2011 http://test.csswg.org/suites/css2.1/20110323/html4/toc.html Contributions to CSS 2.1 test suite http://www.gtalbot.org/BrowserBugsSection/css21testsuite/ Web authors' contributions to CSS 2.1 test suite http://www.gtalbot.org/BrowserBugsSection/css21testsuite/web-authors-contributions-css21-testsuite.html
Received on Saturday, 14 September 2013 20:10:23 UTC