Good explanation, Bill.
And I find ASCII very useful for this purpose.

iñ

2008/11/18 Bill Brown <[EMAIL PROTECTED]>

> Mark Wheeler wrote:
> > Yep! That did the trick. I've run into this before, but it was a
> > while back. What is it about adding the padding that does the trick?
> > Mark
>
> Hi Mark.
>
> Glad it helped.
>
> Basically, I think when you have an element with no border or padding,
> the margin looks like this:
>
> m m m m <-- top margin
> sometext
> m m m m <-- bottom margin
>
> ...which means that when it's followed by another element, it looks like
> this:
>
> m m m m  <-- top margin
> sometext
> m m m m  <-- bottom margin
>  m m m m <-- top margin
> sometext
>  m m m m <-- bottom margin
>
> ...and the margins collapse like this:
>
> m m m m  <-- top margin
> sometext
> mmmmmmmm <-- top and bottom margin
> sometext
>  m m m m <-- bottom margin
>
> ...like a kind of zippering effect. When you add a border or padding, it
> changes the nature of the imaginary box holding the content inside an
> element so that the margin now looks like this:
>
> m m m m
> sometext
> pppppppp <-- some bottom padding will create the solid margin
> mmmmmmmm <-- allowing this margin to exist on its own...
> m m m m  <-- ...separated from this margin here
> sometext
> m m m m
> mmmmmmmm <-- the border on this element will do it too
> bbbbbbbb
> sometext
> m m m m
>
> I know the ASCII might not be the best way to demonstrate this, but
> hopefully, it gives you at least some idea of what's going on there with
> the box model.
>
> Anyway, I'm glad you were able to get it working.
> --Bill
>
>
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-- 
Iñigo Medina García
Tecnología

http://www.toprural.com
Tu guía de turismo rural
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