viewport-units-rounding-2.html

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<!DOCTYPE HTML>

<title>viewport units rounding test</title>

<meta charset="UTF-8">

<style>

body > div > div { line-height: 1px }

span {

  display: inline-block;

  height: 1px;

  width: var(--w);

  vertical-align: bottom;

span:nth-child(1) {

  background: red;

span:nth-child(2) {

  background: white;

  margin-left: var(--negw);

</style>

<body>

<script>

for (var p = 0; p < 20; ++p) {

  var position = ((20 * p) + (p / 50)) + "px";

  var container = document.createElement("div");

  container.style.position = "absolute";

  container.style.top = "0px";

  container.style.left = position;

  for (var w = 0; w < 99; ++w) {

    var width = (0.5 + w / 100) + "vw";

    var div = document.createElement("div");

    div.setAttribute("style", "--w: " + width + "; " +

                              "--negw: -" + width);

    div.appendChild(document.createElement("span"));

    div.appendChild(document.createElement("span"));

    container.appendChild(div);

  document.body.appendChild(container);

</script>