Markdown: add ability to not escape html characters in markdown

[Hugo-Trentesaux]

Currently, when exporting markdown to html, all html special characters are escaped:

using Markdown
a = Markdown.parse("This is *important* text with <i>html</i> in it");
# parsed as
Markdown.Paragraph(Any["This is ", Markdown.Italic(Any["important"]), " text with <i>html</i> in it"])
# then exporting to html
Markdown.html(a)
# output below
"<p>This is <em>important</em> text with &lt;i&gt;html&lt;/i&gt; in it</p>\n"

and there is no way of getting such an output:

<p>This is <em>important</em> text with <i>html</i> in it</p>

So, this issue is a feature request.

It could even be the default behavior for all markdown blocks except code block.

(similar to #34042)

[fredrikekre]

Duplicate of #17837 (It is escaped since the parser doesn't know this is HTML and thus has to escape it.)

[KDr2]

I also request a new feature of Markdown here: Comment Support.

It was discussed recently here: https://discourse.julialang.org/t/does-markdown-support-comments/37607

If we have a way to not escape HTML tags as it is proposed in this issue, I think we can use <!-- --> as comments then?

[stevengj]

Closing as a duplicate.