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$ perl -MMojo::DOM -E 'my $dom = Mojo::DOM::->new("<p></p>"); my $x = 
+$dom->at("p.missing")->text(); say defined $x ? "not missing" : "real
+ly missing"'
Can't call method "text" on an undefined value at -e line 1.

$ perl -MMojo::DOM -E 'my $dom = Mojo::DOM::->new("<p></p>"); my $x = 
+$dom->at("p.missing"); say defined $x ? "not missing" : "really missi
+ng"'
really missing

$ perl -MMojo::DOM -E 'my $dom = Mojo::DOM::->new(q{<p class="missing"
+></p>"}); my $x = $dom->at("p.missing"); say defined $x ? "not missin
+g" : "really missing"'
not missing