Use of document.write() for streaming HTML parse

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As shown in Jake Archibald’s Fun hacks for faster content, document.write() may bizarrely have a place in fast in-page loading:

By streaming the content via the iframe, content appears 1.5 seconds sooner. The avatars also finish loading half a second sooner - streaming means the browser finds out about them earlier, so it can download them in parallel with the content.

This technique is a really good way to make navigation transitions with traditional server-side rendering, so I’d hate to see it disallowed entirely.