Generated by SassMeister.com.

SassMeister-input-HTML.jade

ul.parent
  li.foo words askjfhasdkjfhfasdlkfjhas dlkfjhasdflkjahsdflkajsdhf
  li
  li words
  li
    |then i can even 
    a(href="#") create a link

SassMeister-input.scss

// ----
// Sass (v3.3.7)
// Compass (v1.0.0.alpha.18)
// ----

.parent li::first-line {
  color:blue;
  text-transform: uppercase;
  font-size: 1.3em;
}
.parent {
  width: 400px;
  background-color: #f9f9f9;
}

SassMeister-output.css

.parent li::first-line {
  color: blue;
  text-transform: uppercase;
  font-size: 1.3em;
}

.parent {
  width: 400px;
  background-color: #f9f9f9;
}

SassMeister-rendered.html

<ul class="parent">
  <li class="foo">words askjfhasdkjfhfasdlkfjhas dlkfjhasdflkjahsdflkajsdhf</li>
  <li></li>
  <li>words</li>
  <li>then i can even <a href="#">create a link</a></li>
</ul>