Modified version of Basic Styles addon to use computed style information to handle inherited text styles better.
Now style buttons like bold/italic/underline correctly reflect actual text formatting applied to an active selection even when it's inherited from a style preset (i.e. 'Heading' or 'Subtitle') and can be used to override its effect.
The recommended way to install all CKEditor add-ons is to create a custom build by using Online builder. To do that, click the Add to my editor button on the plugin page. When you are done, click the Build my editor button on the right side of the page to go to Online builder.
Note: This add-on is already selected to be a part of your current build.
Add-on installation instructions
If you want to add the plugin manually, you will need to:
Extract the downloaded plugin .zip into the plugins folder of your CKEditor installation. Example: