Where to write links in .tpl file?

Question

CMS

Good afternoon!
There was a need to embed a button on the site, when clicked, a pop-up window would appear.
I made the window itself, the question is where to place the code?
After all, there are no tags in .tpl files.
I need to register a link to a file with a style for this window and a link to a js file
. Thanks in advance!

Answer 1

After all, there are no tags in .tpl files

wow, so add