@Cacophony (View Post)
The forum post editor is not tailored to produce an indent. It will not show anyways unless you place your text inside a <code> or a <pre> tag, as HTML regularly collapses "breaks" whitespace into a single whitespace. This is because often website source code is indented and those indentations would have to be cancelled out in order to show the text here.

For a temporary solution, you can either use &nbsp; as a "non-breakable space" that won't be collapsed, or use code tags, which would be far better.

Tabs as such can be augmented via tables.