We often reach for JavaScript because that's how we've learned to solve frontend problems. Need to calculate a layout value? Write a function. Need to coordinate styles across components? Add some logic. Need to handle a visual behavior? Start with an event listener.

Sometimes that's the right call. But sometimes we're writing JavaScript to work around a limitation that no longer exists.

CSS has evolved far beyond styling colors, spacing, and typography. Features like container queries, :has() , and modern layout capabilities have changed how we can approach problems that once required extra code.

The interesting part isn't that CSS can replace JavaScript. It can't, and it shouldn't try to.…