Update CSS tests to revision 31d63cc79bd4c929ed582229e936d7b389f3e6ab

tests/wpt/css-tests/css-flexbox-1_dev/html/flexbox-align-self-vert-003.htm

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+<!DOCTYPE html>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+--><!-- Testcase for align-items / align-self behavior, with all the possible
+     values included on different items within a flex container, and with the
+     flex container being skinnier than its items. --><html>
+  <head>
+    <title>CSS Test: Testing the behavior of 'align-self' with a vertical flex container that's skinnier than its items</title>
+    <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
+    <link rel="help" href="http://www.w3.org/TR/css-flexbox-1/#align-items-property">
+    <link rel="match" href="reference/flexbox-align-self-vert-003-ref.htm">
+    <style>
+      .flexbox {
+        border: 1px dashed blue;
+        width: 4px;
+        display: flex;
+        flex-direction: column;
+        font-family: sans-serif;
+        font-size: 10px;
+        margin-left: 80px;
+      }
+
+      div.big {
+        font-size: 18px;
+        width: 50px;
+      }
+
+      /* Classes for each of the various align-self values */
+      .flex-start {
+        background: lime;
+        align-self: flex-start;
+      }
+      .flex-end {
+        background: orange;
+        align-self: flex-end;
+      }
+      .center {
+        background: lightblue;
+        align-self: center;
+      }
+      .baseline {
+        background: teal;
+        align-self: baseline;
+      }
+      .stretch {
+        background: pink;
+        align-self: stretch;
+      }
+   </style>
+  </head>
+  <body>
+    <div class="flexbox">
+      <div class="flex-start">start</div>
+      <div class="flex-start big">a b</div>
+      <div class="flex-end">end</div>
+      <div class="flex-end big">a b</div>
+      <div class="center">center</div>
+      <div class="center big">a b</div>
+      <div class="baseline">base</div>
+      <div class="baseline big">abc</div>
+      <div class="stretch">stretch</div>
+      <div class="stretch big">a b</div>
+    </div>
+  </body>
+</html>