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Webmaster Forum / HTML, CSS, Scripts / CSS / January 2007css 2.1 negative width calculations?
Hi, I am reading CSS 2.1 draft specification: http://www.w3.org/TR/2006/WD-CSS21-20061106/ Part of section 10.3.3 (Block-level, non-replaced elements in normal flow) reads: If there is exactly one value specified as 'auto', its used value follows from the equality. In the case that margin-left + margin-right > width of containing block (see the constraint in 10.3.3) this would mean that 'width' would be computed as a negative value in order for the equality to balance. I'm not sure how a negative width is interpreted. It would seem that from tests in firefox and opera that they treat used width as 0. > Hi, > [quoted text clipped - 11 lines] > (see the constraint in 10.3.3) this would mean that 'width' would be > computed as a negative value in order for the equality to balance. Yes. > I'm not sure how a negative width is interpreted. It would seem that > from tests in firefox and opera that they treat used width as 0. I'm not sure the spec says anywhere how to interpret a negative width. You can't actually set a negative value for the width property (that's "illegal"), although as you say the computed value can be negative. It makes most sense for it to be rendered as equivalent to 0 (rather than rendering the box inside-out!) > Hi, > [quoted text clipped - 14 lines] > I'm not sure how a negative width is interpreted. It would seem that > from tests in firefox and opera that they treat used width as 0. The other thing is that even if the browser does follow the spec and compute a negative width, and renders that as a zero width (which seems the only logical choice), then it has to choose whether to respect the styled value of margin-left or the styled value of margin-right-- it can't make both true. What they mostly seem to do is clamp width to 0 and solve the equality by taking the difference out of margin-right (and it seems logical it ought to be margin-left if direction is rtl). I think it would make more sense if the spec were written that way. |
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