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print start_table({-border => '', -width => "100%"}),
  (
...
   Tr(td('foo is set'), td('foo is still set')) :
   Tr(td('foo is not set'), td('foo is still not set'))
  ), end_table;

print start_table({-border => '', -width => "100%"});
if ($foo) {
...
  print Tr(td('foo is not set'), td('foo is not set, yet'));
}
print end_table;