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The article starts out shorter, so it sticks. Add paragraphs until the article is taller and the sidebar sticks instead. Removing them switches back.

This sidebar starts taller than the article. Scroll, and the article stays in view. It switches when the article becomes the taller column.

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras tempus id leo et aliquam. Proin consectetur ligula vel neque cursus laoreet.

Nullam dignissim, augue at consectetur pellentesque, metus ipsum interdum sapien, quis ornare quam enim vel ipsum.

In congue nunc vitae magna tempor ultrices. Cras ultricies posuere elit. Nullam ultrices purus ante, at mattis leo placerat ac.

Nunc faucibus ligula nec lorem sodales venenatis. Curabitur nec est condimentum, blandit tellus nec, semper arcu.

Nullam in porta ipsum, non consectetur mi. Sed pharetra sapien nisl. Aliquam ac lectus sed elit vehicula scelerisque ut vel sem.

Curabitur rhoncus, arcu at placerat volutpat, felis elit sollicitudin ante, sed tempus justo nibh sed massa.

Integer vestibulum non ante ornare eleifend. In vel mollis dolor. Ut ut semper nisl, vitae aliquet augue.

This article stays in view while it is the shorter column.