viewport-units-rounding-1-frame.html

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<!DOCTYPE HTML>

<title>subframe for test of viewport units rounding</title>

<meta charset="UTF-8">

<style>

html, body { margin: 0; padding: 0; border: none }

body > div {

  background: red; /* should never show */

  overflow: hidden; /* block formatting context */

body > div > div {

  float: left;

  height: 10px;

body > div.w25 > div { width: 25vw; }

</style>

<div class="w25">

  <div style="background: fuchsia"></div>

  <div style="background: aqua"></div>

  <div style="background: silver"></div>

  <div style="background: yellow"></div>

</div>

<!--

  Really, though, anything that is a multiple of 5vw will always

  produce a round number of appunits when starting from an integer

  number of pixels, since 5vw is 1/20 of the viewport.

  So, more interesting:

-->

<div>

  <div style="width: 24vw; background: fuchsia"></div>

  <div style="width: 24vw; background: aqua"></div>

  <div style="width: 24vw; background: silver"></div>

  <div style="width: 24vw; background: yellow"></div>

  <div style="width: 4vw; background: gray"></div>

</div>

<div>

  <div style="width: 21vw; background: fuchsia"></div>

  <div style="width: 21vw; background: aqua"></div>

  <div style="width: 21vw; background: silver"></div>

  <div style="width: 21vw; background: yellow"></div>

  <div style="width: 16vw; background: gray"></div>

</div>