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+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8"><title>CSS Test: Absolutely positioned children of flex container with CSS align</title>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-flexbox/#abspos-items">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1386654">
+<link rel="match" href="https://hg.mozilla.org/mozilla-central/raw-file/6538de3b6137/layout/reftests/w3c-css/submitted/flexbox/position-absolute-containing-block-001-ref.html">
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<style>
+.parent {
+  position: fixed;
+  top: 0;
+  left: 0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 200px;
+  height: 200px;
+  background: yellow;
+}
+
+.child {
+  position: absolute;
+  width: 100px;
+  height: 100px;
+  background: green;
+}
+</style>
+</head><body><div class="parent"><div class="child"></div></div>
+</body></html>
+\ No newline at end of file