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+// Test labels.
+
+--- label-show-where-selector ---
+// Test labelled headings.
+#show heading: set text(10pt)
+#show heading.where(label: <intro>): underline
+
+= Introduction <intro>
+The beginning.
+
+= Conclusion
+The end.
+
+--- label-after-expression ---
+// Test label after expression.
+#show strong.where(label: <v>): set text(red)
+
+#let a = [*A*]
+#let b = [*B*]
+#a <v> #b
+
+--- label-on-text ---
+// Test labelled text.
+#show "t": it => {
+  set text(blue) if it.has("label") and it.label == <last>
+  it
+}
+
+This is a thing #[that <last>] happened.
+
+--- label-dynamic-show-set ---
+// Test abusing dynamic labels for styling.
+#show <red>: set text(red)
+#show <blue>: set text(blue)
+
+*A* *B* <red> *C* #label("bl" + "ue") *D*
+
+--- label-after-parbreak ---
+// Test that label ignores parbreak.
+#show <hide>: none
+
+_Hidden_
+<hide>
+
+_Hidden_
+
+<hide>
+_Visible_
+
+--- label-in-block ---
+// Test that label only works within one content block.
+#show <strike>: strike
+*This is* #[<strike>] *protected.*
+*This is not.* <strike>
+
+--- label-unclosed-is-text ---
+// Test that incomplete label is text.
+1 < 2 is #if 1 < 2 [not] a label.
+
+--- label-text-styled-and-sequence ---
+// Test label on text, styled, and sequence.
+#test([Hello<hi>].label, <hi>)
+#test([#[A *B* C]<hi>].label, <hi>)
+#test([#text(red)[Hello]<hi>].label, <hi>)
+
+--- label-string-conversion ---
+// Test getting the name of a label.
+#test(str(<hey>), "hey")
+#test(str(label("hey")), "hey")
+#test(str([Hmm<hey>].label), "hey")