websharper.templates/FSharp/SPA/index.html: not avoiding showing templates?

[Martin521]

In the SPA html template you have
<style> /* Don't show the not-yet-loaded templates */ [ws-template], [ws-children-template] { display: none; } </style>
I have 2 questions:

1. None of the browsers seems to show the templates, no matter if I include the above or not. So are these lines still useful?
2. I do see during loading not-yet-replaced text-holes ${.... This is very brief, but on my page quite prominent. So I would love to avoid this. Is there a way to do that? (The display: none for the templates as shown above does not help.)