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Would this also allow for translating e.g. the <a>'s `title` attribute, or e.g. an `aria-label`?

It's something that I definitely plan to add. There's even an open issue about it! https://github.com/projectfluent/fluent.js/issues/185

Great! It sounds like a very cool project to work on :)

What's stopping you from doing that now? Just add a new translation for those labels in the source document and bind it to the attribute tag.