Re: Inequalities in math blocks

[Max Nikulin <manikulin@gmail.com>]

This is a reminder of an old bug. From my point of view it is serious 
enough, but not release critical due to its age.

&<> characters must be escaped as HTML entities when LaTeX snippets and 
blocks are exported for MathJax

Form my year-old notes:
- =#+options: tex:verbatim= properly escapes symbols.
- There are functions that performs such replacement in ox-html and 
ox-odt, but `org-format-latex` resides in org.el, so some refactoring 
and backward compatibility stubs are necessary.

This thread was tracked at https://updates.orgmode.org for a minor fix 
of the manual.

On 07/10/2021 22:05, Max Nikulin wrote:
> On 07/10/2021 20:05, Timothy wrote:
>>> Org should rewrite < and > to &lt; and &gt; to avoid broken HTML, or 
>>> as < and  in general.
>>
>> I think we’ve drifted a bit to the differences in processing (where 
>> the `\( ... \)'
>> vs `$ ... $' comments are most pertinent), but as you say for valid 
>> HTML < and >
>> should be rewritten. I don’t think I’ve seen an issue because MathJax 
>> seems to
>> take care of it, but it looks like MathJax is also fine with &lt; and 
>> &rt;.
> 
> "<" and ">" characters are valid only markup elements in HTML (part of 
> tags, comments). MathJax interprets text content. Normally, to add text 
> "<" or ">", "&lt;" or "&gt;" should be used in HTML sources. Browsers 
> may pass "<" and ">" from source to text content if they are totally 
> confused by invalid markup that does not resemble tags or something 
> else. I do not think, it should be abused.
> 
> I cited MathJax docs just to show a temporary workaround till the bug 
> will be fixed in Org. It is quite strange that Org properly converts 
> "<>&" to entities in text but leaves them as is in math snippets. Unsure 
> whether git history might clarify some reasons of such behavior.