Thank you, although perhaps a newbie might innocently assume the demo packages from the download are intended to work as-is?  I certainly understand that HTMLelements is a bit new, but i would not want a newbie to be discouraged from using the best widget package available.
note:  there are a number of code typos on the page https://www.htmlelements.com/docs/combobox/

<link rel=”stylesheet” href=

seven of the eight stylesheet declarations are missing the leading double-quote character.
Having used jqwidgets now for several years now, I didn’t think there was anything left to impress me. And yet here i am totally amazed once again.   Thank you so much for providing such powerful, useful, and yet so economical webpage additions.