In GitHub markdown <ins>
text</ins>
works just fine.
Markdown doesn't have a defined syntax to underline text.
I guess this is because underlined text is hard to read, and that it's usually used for hyperlinks.
You can wrote **_bold and italic_**
and re-style it to underlined text, like this:
strong>em,
em>strong,
b>i,
i>b {
font-style:normal;
font-weight:normal;
text-decoration:underline;
}
In Jupyter Notebooks you can use Markdown in the following way for underlined text. This is similar to HTML5: (<u>
and </u>
).
<u>Underlined Words Here</u>
Both <ins>text</ins>
and <span style="text-decoration:underline">text</span>
work perfectly in Joplin, although I agree with @nfm that underlined text looks like a link and can be misleading in Markdown.
The simple <u>some text</u>
should work for you.
Another reason is that <u>
tags are deprecated in XHTML and HTML5, so it would need to produce something like <span style="text-decoration:underline">this</span>
. (IMHO, if <u>
is deprecated, so should be <b>
and <i>
.) Note that Markdown produces <strong>
and <em>
instead of <b>
and <i>
, respectively, which explains the purpose of the text therein instead of its formatting. Formatting should be handled by stylesheets.
Update:
The <u>
element is no longer deprecated in HTML5.
Source: Stackoverflow.com