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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="utf-8">
<title>CSS Multi-column Layout Test: Append element to grid with pseudo-elements in multi-column context</title>
<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-multicol-1/">
<link rel="match" href="multicol-dynamic-add-003-ref.html">
<meta name="assert" content="This test checks that dynamically appending an element to a grid container with ::before and ::after pseudo-elements in a multi-column context renders correctly.">
<script>
function runTest() {
document.body.offsetHeight;
var nav = document.createElement("nav");
nav.append("text");
var grid = document.getElementById("grid");
grid.append(nav);
document.documentElement.removeAttribute("class");
}
</script>
<style>
.columns {
columns: 2;
column-fill: auto;
width: 100px;
height: 10px;
}
#grid {
display: grid;
grid: 20px 20px / 40px 40px;
}
#grid::before, #grid::after {
content: "";
grid-row: 1 / 3;
}
nav {
grid-row: 1 / 3;
}
</style>
<body onload="runTest();">
<div class="columns">
<div id="grid"></div>
</div>
</body>
</html>