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you can also set a watch via setWatch and produce some output when button click happens. Then from the website you probably have some handler when new data arrives from the UART. That way you would not need to poll.
check https://github.com/espruino/EspruinoWebTools/blob/master/uart.js#L36
fanoush
@mg
working on it. Thought this was the solution but it's no so simple> UART.eval("BTN3.read()",function(t) { alert('pressed'); });