Generated by SassMeister.com.

SassMeister-input-HTML.jade

p.intro Intro text

p Not intro text

blockquote
  p Blockquote text

hr

a
  img(src='http://placehold.it/350x150')
  
hr

ul
  li List item
  li
    p List paragraph
  li List item
  
hr

p.alert Alert text

SassMeister-input.scss

p:not(.intro) { font-weight: bold; }

p:not(.intro, blockquote) { font-weight: bold; }

a:has( > img ) { border: 2px solid #000; }

li:not(:has(p)) { padding-bottom: 1em; }

p:matches(.alert, .error, .warn) { color: red; }

SassMeister-output.css

p:not(.intro) {
  font-weight: bold;
}

p:not(.intro, blockquote) {
  font-weight: bold;
}

a:has( > img) {
  border: 2px solid #000;
}

li:not(:has(p)) {
  padding-bottom: 1em;
}

p:matches(.alert, .error, .warn) {
  color: red;
}

SassMeister-rendered.html

<p class="intro">Intro text</p>
<p>Not intro text</p>
<blockquote>
  <p>Blockquote text</p>
</blockquote>
<hr/><a><img src="http://placehold.it/350x150"/></a>
<hr/>
<ul>
  <li>List item</li>
  <li>
    <p>List paragraph</p>
  </li>
  <li>List item</li>
</ul>
<hr/>
<p class="alert">Alert text</p>