Qwik resumability
Qwik's innovation: no hydration. The page serialises with all event state baked in ⇒ client "continues" from where the server left off without running JS first.
Miško Hevery (AngularJS founder) created it. Pitch: SPA feel without SPA JS tax. Differs from Islands: even initial render is resumable. More complex mental model ($-suffix on imports). Adoption slow due to learning curve but interest is growing. Competitors: Astro Islands (simpler), React Server Components (different approach to same problem).