[mozey]

Besides the built-in templates/html, there's also this https://github.com/a-h/templ Haven't used it yet, but seems promising

[mozey]

Actually, just remembered why I haven't used it. Although it "Ships with IDE autocompletion", last time I checked that's only on the Go code, not the HTML. Usually I keep my templates as .html files, and find the IDE autocompletion and linter on the HTML more valuable