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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Flexbox Test: gap - wrap lr horizontal</title>
+<link rel="author" title="Adam Argyle" href="mailto:argyle@google.com">
+<style>
+  body {
+    writing-mode: vertical-lr;
+  }
+
+  section {
+    background-color: green;
+    block-size: 100px;
+    inline-size: 200px;
+    display: inline-flex;
+    flex-wrap: wrap;
+  }
+  section > div{
+    background-color: grey;
+    color: white;
+    block-size: 20px;
+  }
+  #bp {
+    inline-size: 120px;
+  }
+  #ww {
+    inline-size: 130px;
+  }
+  #s, #f {
+    inline-size: 40px;
+  }
+  #bp, #ww {
+    margin-inline-end: 20px;
+    margin-block-end: 20px;
+  }
+</style>
+<body>
+  <p>Test passes if there are <strong> green lines between boxes</strong>.</p>
+  <section>
+    <div id=bp>Black Panther</div>
+    <div id=ww>Wonder Woman</div>
+    <div id=s>Storm</div>
+    <div id=f>Flash</div>
+  </section>
+</body>