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Re: line breaks, embellished operators and space-like content

From: David Carlisle <davidc@nag.co.uk>
Date: Mon, 3 Aug 2015 17:38:09 +0100
Message-ID: <55BF98F1.2040303@nag.co.uk>
To: <www-math@w3.org>
On 03/08/2015 15:46, Peter Krautzberger wrote:
> Hi www-math,
> On the MathJax issue tracker
> <https://github.com/mathjax/MathJax/issues/1228> we had a discussion
> revolving around embellished operators and line breaks.
> The example from a user was
> <math xmlns="http://www.w3.org/1998/Math/MathML">
>    <mtext>A</mtext>
>    <mo>+</mo>
>    <mtext>B</mtext>
>    <mspace linebreak="newline" />
>    <mtext>C</mtext>
> </math>
> which won't have a line break in MathJax rendering because the spec
> seems to say it's one big embellished operator.
> My question is: shouldn't a pure linebreak end the scope of an
> embellished operator instead?
> Personally, I find it odd that mtext is considered space-like.
> It does not seem to meet the criteria of the spec ("typically render as
> whitespace", "do not affect the mathematical meaning" -- neither is
> typical for mtext). It seems even more problematic in an HTML5
> context, where mtext is one entry point for HTML mixing.
> Best regards,
> Peter.

Hmm partly the problem may be that the text that pulls in adjacent
"space like" elements into the embellished operator comes from mathml
1.0 which didn't have the linebreak= attribute (introduced in mathml2 )
or the more general linebreak controls introduced at mathml3.

So there is room for some creative interpretation I think. In particular
does the spec actually say that you can not break within an embellished

That's not to say we shouldn't consider an adjustment of the text here
but just as a matter of current interpretation.

[most definitely speaking for myself not giving the formal WG position


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Received on Monday, 3 August 2015 16:41:18 UTC

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