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The \underline command only adds black underline. \usepackage command, however, is not allowed in StackOverflow questions so there is no way to use \color{red}\uline{...}. Is there any chance to apply underline in red like below to text of questions in StackOverflow? Thanks.

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Leucippus
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user5280911
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    The question and solution of Underline Text should be helpful. – Leucippus Nov 10 '20 at 03:23
  • I have explicitly restricted the scope in StackOverflow settings in the original question, which occupies nearly half of the question, not general Latex. – user5280911 Nov 10 '20 at 04:06
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    Questions about MathJax and friends (as used by StackOverflow) are generally off-topic here since they only accept a LaTeX-like input, but are not actually based on TeX or LaTeX. You might have a better chance asking this on StackOverflow (which has a MathJax tag). – moewe Nov 10 '20 at 06:39

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