HTML Template

I am creating an HTML template can I use JavaScript for this template. I can not understand this line also Ensure your item does not require Javascript to function. This category is exclusively for high-level CSS components which go above and beyond what is readily available for free on the web.

where have you found the line? I found this from above link

That one for HTML5 category in CodeCanyon.
For HTML site template you are free to use JS assets.