The GitHub - tessus/joplin-plugin-menu-shortcut-toolbar: Additional menu items, shortcuts, and toolbar icons, which are not part of Joplin core. plugin is currently available which adds highlight, strikethrough, underline, superscript and subscript buttons to the markdown toolbar. As functionality from certain plugins has been integrated into the core app lately, and all these options are already available in the desktop Rich text editor of the core app, it could make sense the add these options in the markdown editor as well, without the need for a separate plugin.
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