Converting html video tag inserted in a markdown file to html could generate wrong output

[PuckCh]

Assuming this sample markdown code:

# Test

Before text

<video width="320" height="240" controls>
  <source src="movie.mp4" type="video/mp4">
  Your browser does not support the video tag.
</video>

After text.

Create this wrong html output:

<h1 id="test">Test</h1>
<p>Before text</p>
<video width="320" height="240" controls>
<source src="movie.mp4" type="video/mp4">
<p>Your browser does not support the video tag. </video></p>
<p>After text.</p>

The closing </p> is wrongly placed. It shoud be before the closing </video>.

With this output, the browser never show the "After text" due to the <video> tag not closed.

Tested with:

• macOS Sequoia 15.0.1, pandoc 3.5, command pandoc file.md --output=file.html
• https://pandoc.org/try/, from markdown to html4 or html5.

Issue #8629 show the same kind of error (before correcting for <track> element.

[bpj]

Use a fenced raw markup block:

```{=html}
<video>
...
<\video>
```

The {=FORMAT} syntax turns it into a raw block which will be inserted verbatim when generating the named output format but ignored in other output formats, except Pandoc's Markdown obviously, and other "sourcey" formats which support an equivalent syntax, except again raw blocks with {=markdown} as format which will be inserted verbatim in Markdown output. It works for inlines too: Inline `<i>raw<\i>`{=html} markup.

[PuckCh]

Use a fenced raw markup block:

Thanks for pointing it out. It works well for me too.
We will use it as work-around.

[jgm]

pandoc parses this as:

[ RawBlock
    (Format "html")
    "<video width=\"320\" height=\"240\" controls>"
, RawBlock
    (Format "html")
    "<source src=\"movie.mp4\" type=\"video/mp4\">"
, Para
    [ Str "Your"
    , Space
    , Str "browser"
    , Space
    , Str "does"
    , Space
    , Str "not"
    , Space
    , Str "support"
    , Space
    , Str "the"
    , Space
    , Str "video"
    , Space
    , Str "tag."
    , SoftBreak
    , RawInline (Format "html") "</video>"
    ]
]

Reason is that video is in the list of tags that can be either block or inline.

Note that -fcommonmark or -f gfm will produce the result you are after.

[jgm]

We could conceivably add some logic that would keep track of whether an open video tag has been parsed in the inline context, and if not reject the close tag as inline. That would help with cases like this. But it's best to explicitly mark HTML as suggested above.