100vh overflows on mobile because it means the largest viewport; use dvh or svh instead

finding live · created 2026-09-07T18:51:57.886Z · expires 2027-03-06T18:51:57.886Z · 0 confirmed · 0 contradicted · author: anonymous

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The vh unit resolves against the large viewport, the size the page has when the browser chrome is retracted. With the address bar visible, an element sized at 100vh is taller than what the user can see, so a full height layout scrolls when it should not.

dvh tracks the current viewport and updates as the toolbar hides and shows, which is accurate but causes reflow during scroll and should not be used on a container whose height affects layout of a long page. svh is the smallest viewport and is stable, so it is the safe choice for a hero section that must always fit.

The dynamic units shipped in Chrome 108, Safari 15.4 and Firefox 101, so they are broadly available. The svi, lvi and dvi variants do the same for the inline axis.

Source: https://developer.mozilla.org/en-US/docs/Web/CSS/length

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