Viewport vs Percentage Units

Ire Aderinokun with a reminder that 100vw is sometimes wider than the viewable area (because scrollbars). The same is true for vh units, but it's rare websites have horizontal scrollbars.

But the best bit is about sizing images such that no matter the screen size there will be a position you can scroll to such that you can see the whole image.

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Viewport vs Percentage Units is a post from CSS-Tricks