- From: Anton Prowse <prowse@moonhenge.net>
- Date: Mon, 20 Feb 2012 12:24:55 +0100
- To: W3C www-style mailing list <www-style@w3.org>
- CC: www-style@gtalbot.org
On 20/02/2012 01:14, "Gérard Talbot" wrote: > Margins and block formating contexts > http://www.gtalbot.org/BrowserBugsSection/css21testsuite/marges-contexte-formatage.html > > Are the 6 tests in that page correct? The question is important as there > are diverging implementations. If they are not, please quote the relevant > excerpts of the spec. Note that it's not clear what you're testing, specifically, but I'm assuming that it's the general issue of BFC margins next to floats. I did some analysis a couple of years back on this; you might want to read [1] and its follow-ups. Bert Bos's intention, as stated in that thread, was that this behaviour would be defined more precisely in CSS3. I see nothing controversial about Tests 3 and 6. Something based on those should form part of the test suite. The behaviour of Tests 1 and 2 as regards the left margin of the non-floated BFC, and Tests 4 and 5 as regards the right margin of the non-floated BFC, is undefined in CSS21: # The border box of a table, a block-level replaced element, or an # element in the normal flow that establishes a new block formatting # context (such as an element with 'overflow' other than 'visible') # must not overlap the margin box of any floats in the same block # formatting context as the element itself. Note how the spec says nothing about how to handle the float-facing margin of the non-floated BFC. Your conclusion that some browsers are incorrect as regards the *right* margin in Tests 1, 2 and 4 looks good to me; there are clearly some browser bugs here. (In Test 5 I believe the "incorrect" behaviour is permitted by the spec, but given that the behaviour is not symmetrical wrt Test 2 it's probably just coincidence.) [1] http://lists.w3.org/Archives/Public/www-style/2009Jan/0275.html (the thread is disjointed in the archive, so it's best to do an Advanced Search for the subject line instead). Cheers, Anton Prowse http://dev.moonhenge.net
Received on Monday, 20 February 2012 11:25:29 UTC