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+<!DOCTYPE HTML>
+<!--
+ Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html><head>
+ <title>CSS Grid Test: dynamic change .left on abs.pos. item w. align-self:center</title>
+ <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1405319">
+ <link rel="help" href="https://drafts.csswg.org/css-align-3/#propdef-align-self">
+ <link rel="match" href="grid-item-align-dynamic-pos-001-ref.html">
+ <style type="text/css">
+html,body {
+ color:black; background-color:white; font:16px/1 monospace; padding:0; margin:0;
+}
+
+.grid {
+ display: inline-grid;
+ position: relative;
+ background: lightgrey;
+ grid: 50px 50px / 50px 50px;
+}
+
+#item {
+ background: grey;
+ position: absolute;
+ align-self: center;
+ left: 10px;
+}
+
+ </style>
+</head>
+<body>
+
+<div class="grid">
+ <div id="item">X</div>
+</div>
+
+<script>
+ document.body.offsetLeft;
+ var items = Array.prototype.slice.call(document.querySelectorAll('#item'));
+ items.map(item => item.style.left = "20px");
+ document.body.offsetLeft;
+</script>
+
+</body>
+</html>