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Say goodbye to writing multiple kinds of plugins and userscripts for random websites I guess. I don't want the transition to wasm because it looks like it will make most things unchangeable binary blobs

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I don't follow? when you write userscripts you modify the dom not the already running scripts usually, no?

Wouldn't there be a point where the mainstream approach is to just have compiled blobs write directly to the canvas, say a point where someone compiles a qt application and hosts it on their website.

What can you even modify there, when all the structure is flattened into a single layer

You can already make apps that write directly to a canvas today, and almost nobody does because they want what the DOM provides for them. Wasm changes nothing about the APIs available to web apps.

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