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+<!DOCTYPE html>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!-- Testcase for how we compute the baseline of a horizontal flex container
+     with no flex items. This is the main-axis baseline. The spec says this
+     about this case:
+     https://drafts.csswg.org/css-flexbox/#flex-baselines
+     "Otherwise, the flex container has no first/last main-axis baseline set,
+     and one is synthesized if needed according to the rules of its alignment context."
+
+     The alignment context in this case is inline-level so the margin-box
+     should be used to synthesize the baseline.
+-->
+<html>
+<head>
+  <title>CSS Test: Testing the baseline of an empty horizontal flex container</title>
+  <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
+  <link rel="help" href="http://www.w3.org/TR/css-flexbox-1/#flex-baselines">
+  <link rel="match" href="flexbox-baseline-empty-001-ref.html">
+  <meta charset="utf-8">
+  <link rel="stylesheet" type="text/css" href="support/ahem.css" />
+  <style>
+    body {
+      font: 20px Ahem;
+    }
+    .flexContainer {
+      display: inline-flex;
+      height: 16px;
+      width: 16px;
+      background: purple;
+      border: 0px dotted black;
+      /* (Elements that want a border will set their border-width.) */
+    }
+  </style>
+</head>
+<body>
+  A
+  <div class="flexContainer"></div>
+  <div class="flexContainer" style="padding-bottom: 20px"></div>
+  <div class="flexContainer" style="padding: 10px"></div>
+  <div class="flexContainer" style="border-width: 3px"></div>
+  <div class="flexContainer" style="border-bottom-width: 4px"></div>
+  <div class="flexContainer" style="border-bottom-width: 4px; margin: 2px"></div>
+</body>
+</html>