How Can I Determine Viewport Width (vw) Excluding Scrollbars in CSS?

Determining Viewport Width (vw) Excluding Scrollbars using CSS

As mentioned in the query, calculating the viewport width (vw) without scrollbars solely through CSS can be challenging. The conventional vw measurement includes the space occupied by scrollbars.

CSS Solution without JavaScript

However, a workaround exists using the calc function in CSS. By subtracting the difference between 100% (viewport width with scrollbars) and 100vw (viewport width excluding scrollbars) from 100vw, we effectively eliminate the scrollbar's width:

<code class="css">body {
  width: calc(100vw - (100vw - 100%));
}</code>

Example

For instance, if the viewport width is 1920px and the scrollbar occupies 17px, the result:

100vw - (100vw - 100%) = 1920px - (1920px - 1903px) = 1903px

Conclusion

By utilizing this calc expression, it is possible to calculate the viewport width without scrollbars, providing a more accurate representation of the actual visible area.

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