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At first I was reluctant to use stylesheets because older browsers do not support them. An early version of z2html.sed controlled the appearance and indentation of the Z text using font face and blockquote tags instead.
Here is z2html-nostyle.sed.
Here is the test page, translated by the no-stylesheet version.
Later I decided that stylesheets were too useful to do without. Few people are still using those old browsers, and for those that do, the appearance is adequate.