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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Basic User Interface Test: box-sizing:border-box floors to 0</title>
+<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+<link rel="help" href="https://drafts.csswg.org/css-ui-3/#box-sizing">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<meta name="assert" content="Floor width and height computation to 0 as they cannot be negative.">
+<style>
+#red {
+ position: absolute;
+ width: 100px;
+ height: 100px;
+ background:red;
+ z-index: -1;
+}
+#test {
+ box-sizing: border-box;
+ border: 50px green solid;
+ width: 10px;
+ height: 10px;
+}
+</style>
+<body>
+ <p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+ <div id=red></div>
+ <div id=test></div>
+</body>