html - Is it possible to select elements that do not have a child of a certain type?

There is a spec, currently in draft, for a :has() pseudo-class. No browser supports it yet. If the spec is someday approved and implemented, you'd be able to do this:

a:not(:has(img)) {
    // Styles
}

The MDN page says that :has would never work in stylesheets, only in JavaScript; but in saying that, it links to a section of the spec about a "dynamic selector profile" that apparently no longer exists.

I think the browser vendors typically have a problem with implementing CSS features that require knowledge of the DOM that only exists after the selected element is created, so I don't know if we should get our hopes up for this. Someone who follows the mailing lists or is generally smarter than me might offer a better prognosis.