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+<!DOCTYPE html>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4659">
+<link rel="help" href="https://drafts.csswg.org/css-align-3/#abspos-sizing">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<meta name="assert" content="The available space for a box with center alignment is double the distance between the center of the static position rectangle and the closest edge of the containing block in the relevant axis.">
+<style>
+#containing-block {
+ position: relative;
+ width: 100px;
+ height: 100px;
+ background: red;
+ display: flex;
+}
+
+#containing-block > div {
+ flex-grow: 1;
+}
+
+#inner-flex {
+ display: flex;
+ align-items: center;
+}
+
+span {
+ display: inline-block;
+ inline-size: 50px;
+ block-size: 10px;
+}
+</style>
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div id="containing-block" style="flex-direction: column;">
+ <div id="inner-flex" style="margin: 10px; width: 100px;">
+ <div style="position: absolute; left: 0; width: 100px; background: green; writing-mode: vertical-rl;">
+ <span></span>
+ <span></span>
+ </div>
+ </div>
+ <div style="width: 100px; background: green;"></div>
+</div>