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In theory. The Sciter engine is not far off that, though it uses its own scripting language:

EDIT: reply to c-smile below (HN won’t let me reply, sigh):

My “in theory” was referring to Kosmonaut. Then I pointed out Sciter as evidence that something similar has already been done.

The logic can be written in Rust with [1], it's exactly like he wants: rust[2] + css + html.

Why "in theory"? Here are real life applications: https://sciter.com/#customers

My “in theory” was referring to Kosmonaut. Then I pointed out Sciter as evidence that something similar has already been done.