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The linter will flag the fr unit as an error when used in external stylesheets. DW has been that way since at least 2018.
If the code validates otherwise (use the validator here: https://jigsaw.w3.org/css-validator/), you can safely ignore DW's Linter.
Add your voice to the official bug report here: https://dreamweaver.uservoice.com/forums/382851-adobe-dreamweaver-bugs/suggestions/35722081-error-fo...
thank you very much
Turn off Code Linting in Preferences or ignore the warning. Your choice. See screenshot.