HTML5 Threaded Rendering?

Development Rendering
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1

How does UE4’s threaded rendering model work when packaged for HTML5?

Given that the Emscripten compiler converts all game code to JavaScript (a single-threaded language), I would guess that GameThread and RenderThread operations proceed sequentially? (GameFrame0 → RenderFrame0 → GameFrame1 → …).

2

Opening the console and typing “Stat Thread” shows that HTML5 projects are indeed run single-threaded. However, I still have no insight into the scheduling of game/render tasks on this single thread.