While good and illustrative, that page is based on the very restrictive view, that of choosing only one candidate. This applies to presidential elections, sure.

While good and illustrative, that page is based on the very restrictive view, that of choosing only one candidate. This applies to presidential elections, sure. There can be only one president. But most countries don't have one-member sized voting districts in their parliament elections, rather they choose 10 to 30 members per voting district.