As designed New editor doesn't seem to allow tabs (indent)

Weird, I could swear it showed real tabs the last time I tested it.
If the output is in <pre> tag or white-space property is styled as pre then it might be the case. See this reference. I am not very sure though that it will display tabs as tabs or convert it to a single space.

You can also indent the text on tabs to emulate this effect. :)
 
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