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Discussion on: Why 100vw causes horizontal scrollbar

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Joost Kiens

You are right, it has nothing to do with your explanation. However, it does have an impact on your debug code, specifically the border.

If the box-sizing is the default content-box, borders will be added to the total width of an element. So by using a border of 1px, you create a total width of 100% + 2px, which means you still get a horizontal scrollbar.

When using an outline this would not be an issue since an outline has no layout.