How to enable syntax highlighting?

[Yt.w]

I did not config any stuff related highlighting and highlighting is not working on my forum.

how I coding

Showing

Here is my setting

[Yt.w]

r

the html code looks correct on my site

[Yt.w]

Hello, ruby is in my list.
Sorry that I made a misleading screenshoot

[Yt.w]

Looks like it was a CORS problem, any one can help me to solve it?

formatter.js:383  Uncaught (in promise) TypeError: Failed to resolve module specifier '/highlight-js/xxx.jp/9797975efac87d28baa695ae13ca72ccaf5120f5.js'. The base URL is about:blank because import() is called from a CORS-cross-origin script.
    at g (formatter.js:383:1)
    at m (formatter.js:383:1)
    at h (formatter.js:383:1)
    at p (formatter.js:383:1)
    at topic-link.js:14:1
    at formatter.js:383:1
    at composer.js:867:1
    at Array.forEach (<anonymous>)
    at k._decorateAndAdopt (composer.js:867:1)
    at k.init (composer.js:867:1)
    at e (jquery.js:10:1)
    at e (jquery.js:10:1)
    at e (jquery.js:10:1)
    at e (jquery.js:10:1)
    at e (jquery.js:10:1)
    at e (jquery.js:10:1)
    at Object.e [as render] (jquery.js:10:1)
    at jquery.js:10:1
    at e.exports (jquery.js:10:1)
    at jquery.js:10:1
    at Object.l [as patch] (jquery.js:10:1)
    at e.exports (jquery.js:10:1)
    at jquery.js:10:1
    at Object.l [as patch] (jquery.js:10:1)
    at e (jquery.js:10:1)
    at e.rerenderWidget (user-status-bubble.js:12:1)
    at invoke (backburner.js.js:280:1)
    at h.flush (backburner.js.js:197:1)
    at p.flush (backburner.js.js:358:1)
    at B._end (backburner.js.js:798:1)
    at B._boundAutorunEnd (backburner.js.js:523:1)

[Yt.w]

self solved

I changed /lib/highlight_js.rb
from

def self.path
    "/highlight-js/#{Discourse.current_hostname}/#{version SiteSetting.highlighted_languages}.js"
end

to

def self.path
    "https://#{Discourse.current_hostname}/highlight-js/#{Discourse.current_hostname}/#{version SiteSetting.highlighted_languages}.js"
end