Home >Web Front-end >CSS Tutorial >Width: 100% vs. width: 100vw: What\'s the Key Difference?
When attempting to size elements to the screen height, you might encounter a dilemma between using "width:100%" and "width:100vw." Both approaches yield different results, raising the question: what's the fundamental distinction between these two units?
The key difference lies in the nature of viewport units like "vw" and "vh." These units reference the dimensions of the viewport, which encompasses the entire visible screen. In contrast, "width:100%" aligns the element's size to the width of its parent container.
If you set "width:100vw," the element's width will match the viewport's width precisely. However, this includes the document's margin, which can add extra space beyond the intended content area.
To make elements fill the entire horizontal screen, irrespective of margins, ensure that the body has no margin. Setting "body { margin: 0 }" will align the viewport width seamlessly with the full screen width.
Beyond achieving precise screen sizing, viewport units offer several benefits:
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