I added the referrerPolicy property to an <img> tag and it failed on svelte-check with typescript enabled (svelte-check --tsconfig ./tsconfig.json).
Error: Type '{ src: any; referrerpolicy: string; }' is not assignable to type 'HTMLProps<HTMLImageElement>'.
Property 'referrerpolicy' does not exist on type 'HTMLProps<HTMLImageElement>'. (ts)
Example source:
<img src="https://domain.com/myImage.jpg"
referrerPolicy="no-referrer" />
It looks like this would be fixed by adding referrerpolicy to the long list of accepted HTML props in https://github.com/sveltejs/language-tools/blob/master/packages/svelte2tsx/svelte-jsx.d.ts