In the GCC documentation (gcc/doc/install.texi) we have the following texinfo snippet
@emph{You should substitute @samp{i686} in the above command with the appropriate processor for your host.} makeinfo 4.8 translates this to <p><em>You should substitute `<samp></em><span class="samp">i686</span> <em></samp>' in the above command with the appropriate processor for your host.</em> which is not valid HTML 4.01 nor XHTML 1.0 transitional according to validator.w3.org. (The original file is at <http://gcc.gnu.org/install/specific.html>.) Gerald