On Wed, 15 Nov 2023 18:48:59 GMT, Jonathan Gibbons <j...@openjdk.org> wrote:

>> Hmm.   teeny-tiny "yes", dominated by a big "BUT".
>> 
>> There is no easy simple direct support for Markdown in user-defined taglets, 
>> since there is no way to know the syntactic form of user-defined tags. We 
>> might be able to do something for user-defined tags given on the command 
>> line (with `-tag`) but in general we should be wary and think carefully 
>> about putting any headings inside any block tag, because block tags get 
>> converted to HTML definition lists.
>> 
>> ---
>> 
>> Separately, generally speaking, the Markdown headings in any doc comment 
>> should start at level 1 and increase from there. An offset will be added 
>> during translation to give the correct heading level in the overall page. 
>> There is a guard in the code (but no warning as yet) if you "overflow" 
>> heading level 6.  For example, if you go overboard and use `#### my heading` 
>> in the comment for a method (where the offset for headings is 3), it will 
>> (currently) max out at level 6.  Generating warnings for questionable 
>> Markdown is somewhat against the spirit of Markdown. It would seem a bit 
>> weird to warn against an obscure case like overflowing headings when the 
>> general policy for real errors is no message and just show the literal text.
>
> Update: 
> Markdown in tags defined by the user on the command-line works pretty much as 
> expected: not great, but not bad.
> 
> Headings in user-defined tags work, but are semantically questionable, since 
> the tags are generated inside a definition list (which itself is maybe 
> questionable, these days.). There is (currently) no special accommodation for 
> the "virtual heading" in the presentation of the block tag.
> 
> Headings, sections, HTML 5, Markdown and taglets are a complicated mess, and 
> probably better discussed and tracked in JBS.

Understood. FWIW, here are a few examples of headings in user-defined tags in 
JDK:

https://github.com/openjdk/jdk/blob/a6785e4d633908596ddb6de6d2eeab1c9ebdf2c3/src/java.base/share/classes/java/math/BigDecimal.java#L229-L239

https://github.com/openjdk/jdk/blob/ddbbd36e4b064b9e7433f0a55973d72cd6dbc0d3/src/java.xml/share/classes/module-info.java#L402-L420

https://github.com/openjdk/jdk/blob/6f6486e97743eadfb20b4175e1b4b2b05b59a17a/src/jdk.incubator.vector/share/classes/jdk/incubator/vector/Vector.java#L1089-L1093

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PR Review Comment: https://git.openjdk.org/jdk/pull/16388#discussion_r1449039906

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