Richard-
But do text browsers actually indent blockquotes,
lynx, w3m and links all do. None of them support CSS margins.
or do they use colour to distinguish them such as they do for B, I, EM and STRONG?
No.
I think some graphic browsers Italicize a blockquote,
Which ones?
and some screen readers might change voice.
Which is better than doing nothing at all in our context, as they would in the case of CSS.
Regards,
Erik