CSS Regions

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CSS Regions allow you to flow content into a series of containers on a single page. It’s the equivalent of linking text boxes in an application like InDesign. It makes possible some layouts that were previously only possible by blurring the line between data and styles.

This is significant. I’ve been looking for an easy way to style columns on a site for years. It’ll take a while before enough browsers support this by default to make it feasible, though.