is-land using 
Svelte
Note that Svelte requires a compiler for both client and server rendering, in this case provided by Eleventy.
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Client-rendered Svelte
Using autoinit:
Using script:
Server-rendered Svelte (SSR)
No hydration, HTML only
Without hydration, the island is unnecessary.
Hello from Svelte
With Hydration
Using autoinit:
Hello world
Using script: