- From: Mike Sherov <mike.sherov@gmail.com>
- Date: Wed, 14 Mar 2012 18:13:04 -0400
- To: Øyvind Stenhaug <oyvinds@opera.com>
- Cc: www-style@w3.org
- Message-ID: <CAD1Dv_JbiUQOGafgGg=HFfQKFaYMArBtZknNCmtDEfeDX9vORA@mail.gmail.com>
Sure, thanks for correcting that. I was a bit oversimplifying the rules. But that's part of the problem, isn't it! The rules are quite complex and CSSOM attempts to clear up the confusion. In http://dev.w3.org/csswg/cssom/#resolved-values, it says that getComputedStyle should return the "resolved" value. It goes on to define what "resolved value" means. Currently, it defines that top/left/right/bottom should return "computed values". I was simply saying that those should change to "used values", which is defined in http://www.w3.org/TR/CSS21/cascade.html#used-value and http://www.w3.org/TR/CSS21/cascade.html#computed-value So, Øyvind, with your input, it doesn't look like most browsers are accurately behaving in accordance with the spec. That's to be expected, seeing it's a fairly new spec, and still an Editor's Draft. No browser is fully using "computed value" nor "used value". With that said, I think we both agree (do we?) that the most USEFUL thing here would be if the spec called out top/left/bottom/right to use "used value" for several reasons: 1. It's what MOST browsers do in MOST cases (besides the glaring exceptions you mentioned above). 2. it's called out as a bug whenever it doesn't return used value (1 browser bug, 2 JS library bugs). 3. Although I haven't checked exhaustively and I'm biased, I've seen no bug reports expressing the need for computed value when used value is returned, i.e. "hey, why doesn't getComputedStyle return "auto" or "10%" when I want it to?" 4. Also, just from a development perspective, I can't imagine wanting "auto" or a percentage returned from getComputedStyle, but that could just be me and my bias again. Those values just aren't useful to me. Thoughts? On Wed, Mar 14, 2012 at 9:46 AM, Øyvind Stenhaug <oyvinds@opera.com> wrote: > On Wed, 14 Mar 2012 13:45:02 +0100, Mike Sherov <mike.sherov@gmail.com> > wrote: > > Currently, IE, FF, and Opera return the "used value" for >> top/left/bottom/right when "display" is not "none". Webkit returns the >> "computed value". >> > > Actually, that's not quite true. IE and Opera resolve percentages, but not > 'auto', for instance (possibly this is closer to what "computed value" was > supposed to mean in CSS 2.0 though I'm not sure). Even Firefox deviates > from the used value in the cases of 'relative' and 'static' position. > > In particular, for <div style="position: relative; top: 50px; bottom: > 10px"></div> all the above browsers return 10px for 'bottom'. Though if > existing content doesn't rely on that, changing it would be nice. > > -- > Øyvind Stenhaug > Core Norway, Opera Software ASA > > -- Mike Sherov Lead Developer SNAP Interactive, Inc. Ticker: STVI.OB
Received on Wednesday, 14 March 2012 22:13:52 UTC