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Test Info:

<!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>