>Build once, run where the runtime in available.

To be fair, that's true of everything. We only take for granted that some runtimes are more common than others.

The only reason the web is a "universal" runtime is that browser vendors ship to every conceivable platform and more or less agree on standards.

Kind of like Java

Java is slow(to start) and memory hungry. That's why it failed so badly. Compare that with JavaScript/Electron.

>Compare that with JavaScript/Electron.

Electron is heavier and even more memory hungry.

I don't know what the GP was thinking. Hopefully exactly that.

Build once, eat memory anywhere.

Please explain how Java “failed so badly”?

It failed so badly "on the web/in browser".

*Build once, run almost Anywhere