Загбар:World's most populated urban areas

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|state=expanded: {{World's most populated urban areas|state=expanded}} to show the template expanded, i.e., fully visible

|state=autocollapse: {{World's most populated urban areas|state=autocollapse}}

shows the template collapsed to the title bar if there is a {{navbar}}, a {{sidebar}}, or some other table on the page with the collapsible attribute
shows the template in its expanded state if there are no other collapsible items on the page