The Composer Highlighted Button theme component adds a button to the Discourse composer that wraps selected text in HTML <mark></mark> tags. denvergeeks provides a summary, preview, repository link, and installation guide. merefield suggests combining this component with others, like the Inserted and Deleted text buttons, into a single component with toggle settings for each feature. denvergeeks agrees and prefers a pop-up row of buttons over a dropdown. RGJ reports a bug in version 3.5.0.beta8-dev, while philh appreciates the component but notes an issue with text clipping when highlighting.
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