How do I select an element only when inside another element?

Question

Simply use the CSS descendant selector (a space) between the parent element and the descendant element:

ul.saft div.textSlide {
    /* CSS rules */
}

* {
  margin: 0;
  padding: 0
}

li {
  list-style-type: none;
}

ul.saft div.textSlide {
  background-color: #f90;
  font-weight: #000;
}

<ul class="saft">
  <li>
    <div class="textSlide">Some text in a textSlide class element</div>
  </li>
</ul>
<div class="textSlide">Some more text, also in a textSlide element</div>

In this case the rules applied to the div of class textSlide will only apply if its ancestor is a ul of the class saft. You could, instead, use the immediate child combinator, the > but then you’d have to specify the div in relation to each parent/ancestor up to the one whose class is required, which gives potentially difficult to maintain CSS (not in this case, but it can, over time, become problematic).

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