demo's tilde key not working on mac french keyboard

[lingtalfi]

Description

On this demo: https://elements.polymer-project.org/elements/iron-a11y-keys-behavior?view=demo:demo/index.html&active=Polymer.IronA11yKeysBehavior,

I have a feedback for all the keys except the tilde key.
I'm using my mac french keyboard, so maybe it's not supported for non-american keyboards?

To do a tilde key on my keyboard, I have to press the "alt+n" combination.
But what is strange is that I can do the question mark, which on french keyboard is also a combination ( shift+[comma] ).

I can even do the backslash, which is the alt+shift+[colon] combination.