Does adding target="_blank" to the <a> tag not work?
Write something like:
<a target="_blank" href="https://m.youtube.com">Youtube</a>.
The target attribute opens the link in a new tab, and one would assume in a browser window, if not already in one.
See the target attribute of <a>: https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/a#target