As was mentioned in the comments above, the material design spec for buttons specifies that the text should be uppercase, but you can easily override its CSS property: paper-button { text-transform: none; }

@use "@material/theme" with (  $primary: #FEDBD0,  $on-primary: #442C2E);

By default, fetch() doesn’t provide a way to intercept requests, but it’s not hard to come up with a workaround. You can overwrite the global fetch method and define your own interceptor, like this

If you're given a set of factories (say, from a gem developer) but want to change them to fit into your application better, you can modify that factory instead of creating a child factory and adding attributes there.