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They're assuming you generated the file in the browser and you don't have a link from a server.

It's possible to create a temporary URL (with data from an ArrayBuffer) entirely client side:

URL.createObjectURL(new Blob(...));

It creates a blob: URL that you can use as a link.

or from a string

That's what they suggested as a fallback, isn't it?

More or less. You don’t necessarily have to simulate a click, though.

Right, there's now a dedicated method: `HTMLInputElement.showPicker()`.