Once you decide on a hljs theme to use, you can search the dropdown for the one you want and save the setting. You will need to refresh the page in order for everything to start working.
Credits
All of the hljs themes included in this component have copyright information in their respective files. The list of all of those authors () is too big to add here, but you can see them here.
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This theme is very useful and running in my site for a long time. How ever I suddenly found it has a problem on firefox. The custom css file blocked by the following header X-Content-Type-Options: nosniff. Console shows that css file MIME type is text/html. No matter which theme I choise the problem still happen on firefox but chrome is fine.
So, this means that the current options are going to stay the same for a while. First, the highlight-js version needs to be updated in tests-passed in Discourse. Then we’d need to wait for a stable release. Updating the themes (even the current ones) would put us in a bad state where it’s guesswork whether the theme works properly on your site or not.