Re: CSS layout and line breaking

On 04/03/2013 06:37, Karl Tomlinson wrote:
>> <mpadded width="height">...</mpadded>
>>>
>>> can make width depends on height is a problem with our curent
>>> approach but that could probably be removed from the MathML spec
>>> (I don't think computing horizontal metrics from vertical metrics
>>> is used in practice).
> Yes, this adds considerable complexity to the algorithm.
>



In some layout systems (TeX for example) this is no complexity at all
and is exactly the same as accessing the width, similarly in the spec it
just fell out naturally by giving all "length" based attributes the same
syntax.

That said, it is I would guess, never used in real documents other
than test files. It really is not worth adding any complexity to support
this. I don't think there is any issue really once the gecko and webkit
implementations have shaken out what works and what doesn't work so well
in a css/browser based context that we publish some kind of note or
profile or whatever detailing any darker corners like this. Whether you
should ignore width="height" or (perhaps better just say height means
"current baseline spacing" or something) could be decided later.


David


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