title: What is the standard syntax for hyperlink in reStructuredText: `Foo`_ or Foo_?
body: <p><a href="http://docutils.sourceforge.net/docs/user/rst/quickref.html#external-hyperlink-targets" rel="nofollow noreferrer">http://docutils.sourceforge.net/docs/user/rst/quickref.html#external-hyperlink-targets</a> shows this example:</p>
  
  <pre><code>External hyperlinks, like Python_.
  
  .. _Python: http://www.python.org/
  </code></pre>
  
  <p>But <a href="http://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html#external-links" rel="nofollow noreferrer">http://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html#external-links</a> shows this example:</p>
  
  <pre><code>This is a paragraph that contains `a link`_.
  
  .. _a link: https://domain.invalid/
  </code></pre>
  
  <p>I am trying to understand which of these two syntaxes are correct and work with all restructuredtext renderers.</p>
  
  <p>Should I use:</p>
  
  <pre><code>Foo_
  </code></pre>
  
  <p>to refer to a hyperlink?</p>
  
  <p>Or should I use:</p>
  
  <pre><code>`Foo`_
  </code></pre>
  
  <p>to refer to a hyperlink?</p>