This plug-in is used to highlight code that is shown in HTML e.g. for API descriptions. You just need to add a selector that the highlighter can find objects for highlighting e.g. you add .please-highlight then every element with that class will be highlighted.
For working Demo just click on:
https://apex.oracle.com/pls/apex/f?p=103428
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Important clarification: My work in the development team of Oracle APEX is in no way related to my open source projects or the plug-ins on apex.world! All plug-ins are built in my spare time and are not supported by Oracle!