astro/.changeset/unlucky-lamps-remember.md

@astrojs/preact	@astrojs/svelte	@astrojs/react	@astrojs/solid-js	@astrojs/vue	astro
minor	minor	minor	minor	minor	minor

Prevent removal of nested slots within islands

This change introduces a new flag that renderers can add called supportsAstroStaticSlot. What this does is let Astro know that the render is sending <astro-static-slot> as placeholder values for static (non-hydrated) slots which Astro will then remove.

This change is completely backwards compatible, but fixes bugs caused by combining ssr-only and client-side framework components like so:

<Component>
  <div>
    <Component client:load>
      <span>Nested</span>
    </Component>
  </div>
</Component>