Can We Calculate Viewport Width Without Scrollbars in CSS?

Calculating Viewport Width Without Scrollbars in CSS

Question: Can we determine the viewport width (vw) excluding scrollbars using solely CSS?

Answer: Yes, it is possible to calculate the vw without accounting for scrollbars using CSS. One method employs the calc() function to subtract the scrollbar width from the viewport width.

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

In this code, 100vw represents the full viewport width, and 100% represents the viewport width without scrollbars. The (100vw - 100%) term effectively calculates the scrollbar width, which is then subtracted from 100vw.

Additional Note: This technique can also be applied to calculate the height of a square that occupies half of the viewport width, excluding 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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