How to automatically add custom classes to headings in content area

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Is there any way I can automatically add a custom class to heading tags (like h1, h2, h3, etc..,) in the content area. I know that I can manually add a class to a sub-heading from the post editor, but I want the class to be applied to all the headings in all the posts. for instance, a normal heading will look something like this <h2>sub-heading</h2> . I want this to be changed to <h2…

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