Getting started with HTML editor for Jira
Install the app HTML editor for Jira
When you open a Issue you have a button that says HTML editor for Jira
Now you are free to add HTML / CSS / Javascript to the editor.
Press save and you are good to go
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com.atlassian.confluence.content.render.xhtml.migration.exceptions.UnknownMacroMigrationException: The macro '
jquery(".wiki-content a").attr("target", "_blank");
' is unknown.