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Quibble. The demo should allow use of the computer's keyboard and Alt key. Point and click with a graphical keyboard is nuts. It should support overstrike for APL's composite symbols. I did a whole lot of APL programming in the '60s and '70s at IBM and consider it IBM's bastard child. There need not have been Matlab.

I'm appalled by the authors enforcement of 1-origin indexing.

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Try typing backquote followed by another character. I believe mapping alt+key in the browser might be difficult.

It's 0-origin indexing.

"Try typing backquote followed by another character."

Sorry, I don't follow?

"It's 0-origin indexing."

Oops. Then I'm ecstatic rather than appalled. :-)

"Try typing backquote followed by another character." I mean the text box at http://ngn.github.io/apl/web/index.html If you type for instance `r in it, you will get a rho symbol, `i for iota, `a `w for alpha and omega, etc

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