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+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>CSS Reftest Reference</title>
+  <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
+  <style>
+  .flexBaselineCheck {
+    display: flex;
+    border: 1px solid black;
+    height: 100px;
+  }
+  .flexBaselineCheck > * {
+    border: 2px solid teal;
+
+    /* In the testcase, the (baseline-aligned) items should all have their
+       bottom borders aligned with the 80px-tall canvas.  In other words, their
+       bottom borders should all be 20px away from the bottom of their flex
+       container.  Here in the reference case, we just use "flex-end" alignment
+       plus a hardcoded 20px margin-bottom to produce a precise reference
+       for what that should look like. */
+    align-self: flex-end;
+    margin-bottom: 20px;
+  }
+  canvas {
+    background: purple;
+    width: 20px;
+    height: 80px;
+    box-sizing: border-box;
+  }
+  .flex {
+    display: flex;
+  }
+  .grid {
+    display: grid;
+  }
+  .multicol {
+    column-count: 2;
+  }
+  </style>
+</head>
+<body>
+  <div class="flexBaselineCheck">
+    <canvas></canvas>
+    <div>block</div>
+    <fieldset><legend>leg</legend>fieldset</fieldset>
+    <div class="flex">flex</div>
+    <div class="grid">grid</div>
+    <div class="multicol">multi<br>col</div>
+    <details open><summary>summary</summary>details</details>
+  </div>
+</body>
+</html>