Minor JS issue for IE9

[sidonaldson]

By default the demo JS line is commented out:

// alert("hello world");

When viewing the full screen results I noticed this demo line accidentally comments out the closing brackets of the listener, this throws an error in IE9.

// alert("hello world"); });

it's super minor, using /* */ instead of double slash will fix it, or forcing a new line.

Sorry, would do a pull request but I'm on work PC

[LeaVerou]

I believe I just fixed it, could you test please?

[sidonaldson]

@LeaVerou yup! fixed :) :+1: