dvmax

A hundredth of the longer side that is visible right now.

Safe to useBaseline: widely available

First version with support, from MDN browser data
BrowserSince
Chrome108+
Chrome Android108+
Edge108+
Firefox101+
Firefox Android101+
Safari15.4+
Safari iOS15.4+

Formula 1dvmax = 1% of max(dvw, dvh)

How it works

1dvmax is 1% of the larger of dvw and dvh, at this moment. Upright, the longer side is the height, so the value follows the toolbars. Wider than tall, the width is the longer side and the number holds steady.

A cover layer of exactly 100dvmax is as long as the longer visible side in both directions, so by definition it leaves no bare area at any moment, including while the toolbars slide. In a tall window the layer is resized every time the toolbars move.

Try it

Viewport units for a window of your choice

Enter a window size, or take the one you have. Ten of each unit comes out as a tenth of the width, the height, the shorter side or the longer one.

10vw
128px
10vh
80px
10vmin
80px
10vmax
128px

On a desktop window svh, lvh and dvh give the same numbers as vh. They differ only while a phone browser shows or hides its toolbars, which this page cannot show.

The same as a table
Ten of each viewport unit in two windows
UnitLaptop, 1280 by 800Phone, 390 by 844
10vw128px39px
10vh80px84.4px
10vmin80px39px
10vmax128px84.4px

What changes it

Moves with
  • the window size
  • phone toolbars
Stays put under
  • the reader's text size
  • page zoom
  • the font in use
  • the query container
  • the writing mode

Reach for it when

A cover shape that follows the visible area as the toolbars move.

Watch out

In a window taller than wide the larger side is the height, so the shape grows and shrinks with the toolbars.

Example Tracks the visible area as the toolbars move.
.wash {
  inline-size: 100dvmax;
  aspect-ratio: 1;
}

MDN (opens in a new tab)Specification (opens in a new tab)