CSS Specificity and Inheritance

The .container rule doesn’t match the p element. So specificity is irrelevant here. Inheritance and specificity are separate concepts and the only time they interact is when more specific/less specific rules contain declarations with inherit. That is not the case here.

As far as the p element is concerned, only the * rule applies, and the * contains its own font-size declaration, and so the specified font size follows that declaration.

If the * rule didn’t have its own font-size declaration, then the p element would inherit from .container.

If you want descendants of .container to take after its font size, you will need an additional .container * rule. Be very careful with the inherit keyword when it comes to relative values, though — you probably meant to keep all descendants the same size, so 1em or 100% is more appropriate here than inherit:

* {
  font-size: 18px;
}

.container {
  font-size: 50%;
}

.container * {
  font-size: 1em;
}
<div class="container">
  <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cupiditate explicabo fugiat laborum minus ullam? Amet delectus facilis id quam temporibus.
  </p>
</div>

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