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That's where XyWrite works for me. I just type "mail.pm" followed by "typef .import.txt" and then import "import.txt" into my mail reader, and the indentation is preserved.
But the same principle applies to hyml documents. They should never be more complicated than they need to be. If the information can be conveyed by straight html, then use that. If it can be conveyed by html & css, then use that. Only use Javascript and other bloatware if absolutely necessary. Then there woul be no need for much of that "Your browser is no longer supported" nonsense.