Tailwind CSS @apply Directive: Silent Failure on Misspelled Utility Classes

This repository demonstrates a subtle bug in Tailwind CSS when using the @apply directive with a misspelled utility class. The issue is that Tailwind doesn't throw an error when the class is misspelled; it simply doesn't apply the style, leading to unexpected behavior that's hard to debug.

Reproducing the Bug

1. Clone this repository.
2. Open bug.html in your browser.
3. Observe that the div with the misspelled class doesn't have the expected red background.