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> With our ‘zero JavaScript’ happy paths now covered, we can have a little more fun when JavaScript is available in the browser.

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JS is available in the browser unless someone knowingly disables it. It is a standard.

JS will fail to execute a lot more often than most people realise, e.g. due to poor network conditions, particularly if hosted on a different origin (first-party JS is far more reliable, and inline JS the most reliable).

> e.g. due to poor network conditions

Do you have any metrics on this? Seems like an extremely rare edge case.

Anecdotally, I haven't experienced it in years.

The (semi-old) UK stats said 1.1% failure rate, but somebody more recent said it had increased to 3%.

That's a lot.

Somebody said is a bad source. 3% failure seems too high given nearly everything requires JS.

"Everything requires this" does not mean "this is always available"!

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