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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Aligning grid items using 'auto' margins and relative sized columns</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="10.2 Aligning with auto margins" href="https://drafts.csswg.org/css-grid/#auto-margins">
+<meta name="assert" content="The 'left' and 'right' margins must be recomputed whenever the grid's width changes.">
+<style>
+ #grid {
+ display: grid;
+ position: relative;
+ background: grey;
+ grid-template-columns: 40% 60%;
+ grid-template-rows: 300px;
+ height: auto;
+ width: 500px;
+ }
+ #grid div {
+ margin: 0px auto 0px auto;
+ }
+ #item1 {
+ background: green;
+ width: 50px;
+ height: 25px;
+ }
+ #item2 {
+ background: blue;
+ width: 100px;
+ height: 25px;
+ }
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="grid">
+ <div id="item1"></div>
+ <div id="item2"></div>
+</div>
+<script>
+setup({ explicit_done: true });
+document.fonts.ready.then(() => {
+ item1.setAttribute("data-offset-x", "75");
+ item2.setAttribute("data-offset-x", "300");
+ checkLayout('#grid', false);
+
+ grid.style.width = "300px";
+
+ item1.setAttribute("data-offset-x", "35");
+ item2.setAttribute("data-offset-x", "160");
+ checkLayout('#grid', true);
+});
+</script>