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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Containment Test: Layout containment supress baseline in flex items</title>
+<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-contain-1/#containment-layout">
+<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-items-baseline">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<meta name=assert content="Flex items with layout containment are treated as having no baseline, for that reason their baseline is synthesized from the flex item's border box when they're baseline aligned.">
+<style>
+#flex {
+ display: inline-flex;
+ align-items: baseline;
+ background: red;
+}
+
+canvas {
+ background: green;
+ width: 50px;
+ height: 100px;
+}
+
+#item {
+ contain: layout;
+ color: transparent;
+ background: green;
+ width: 50px;
+ height: 100px;
+}
+</style>
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div id="flex">
+ <canvas></canvas>
+ <div id="item">item</div>
+</div>