It might be helpful if user agents do not display the <link>
element in <head>.
my $srch = $ctx->{srch} if $ctx;
my $upfx = $full_pfx ? '../' : '../../';
my $idx = $standalone ? " <a\nhref=\"$upfx\">index</a>" : '';
+
+ if ($srch && $standalone) {
+ $idx .= qq{ / follow: <a\nhref="t.atom">Atom feed</a>};
+ }
if ($idx && $srch) {
my ($next, $p) = thread_inline(\$idx, $ctx, $mime, $full_pfx);
if (defined $p) {