The reality is transpiling and including polyfills is quickly becoming the new norm. What’s unfortunate is this means billions of users are getting trillions of bytes sent over the wire unnecessarily to browsers that would have been perfectly capable of running the untranspiled code natively.
script type="module" and put your transpiled fallback in
Most developers think of
<script type="module">as way to load ES modules (and of course this is true), but