Svelte 5: <noscript> breaks hydration

[tombl]

Describe the bug

When generating the client-side code, <noscript> elements are completely stripped out of the template.

This means that the server generates the elements, but the client acts as if they were never there. At best, this throws a hydration error, and at worst the wrong nodes are updated.

I've got a PR that solves this by turning <noscript> into a comment node in the client template.

Reproduction

REPL

<script>
  import { onMount } from "svelte";
  let count = 0;
  onMount(() => count++);
</script>
<noscript>JavaScript is required for this site.</noscript>
<h1>Hello!</h1>
<p>Count: {count}</p>

Results in <h1>Count: 1</h1> <p>Count: 0</p> hydrated to the DOM.
In Svelte 4 this renders fine.

Logs

No response

System Info

System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 18.18.0 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 9.4.2 - /usr/local/bin/npm
    pnpm: 8.10.5 - /usr/local/bin/pnpm
  npmPackages:
    svelte: 5.0.0-next.26 => 5.0.0-next.26

Severity

blocking an upgrade