Change the background color to help visualize color codes in remarkup text.
Proposed syntax: Just the plain hex color code, wrapped in curly brackets. That is, the most standard html/css color syntax, hash mark followed by 3 or 6 hex digits.
So, for example: {#0000ff} would render exactly like inline monospace text, resulting in #0000ff but with a background color that matches the literal color code specified.
This would be useful for discussions about design, specifically I wished for this feature while reviewing D25491: Improve contrast of Links in Dark Mode
This D25540: Add PhutilRemarkupHexColorCodeRule, a new remarkup rule to format color codes should be ready to merge now, if someone wouldn't mind reviewing it.
Well, you know what would be next level for a dev? If (s)he clicks on it, the color is copied to the clipboard. We can't use this behavior, because behaviors loose their state in the remarkup cache...