Calculating Viewport Width (vw) Excluding Scrollbar in CSS Only
The question arises: can CSS alone determine the vw excluding scrollbars? Consider a screen with a 1920px width, where vw returns 1920px. However, the actual body width is approximately 1903px.
To address this discrepancy, utilize the CSS calc() function. By calculating 100vw minus (100vw - 100%), the resulting value represents the vw excluding the scrollbar width.
<code class="css">body { width: calc(100vw - (100vw - 100%)); }</code>
Additionally, this technique can be applied to height calculations. For instance, to create a square that occupies 50% of the viewport width minus 50% of the scrollbar width:
<code class="css">.box { width: calc(50vw - ((100vw - 100%)/2)); height: 0; padding-bottom: calc(50vw - ((100vw - 100%)/2)); }</code>
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