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+<!DOCTYPE HTML>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html><head>
+  <meta charset="utf-8">
+  <title>Reference: Testing track fallback values</title>
+  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1151214">
+  <style type="text/css">
+html,body {
+  color:black; background-color:white; font-size:16px; padding:0; margin:0;
+}
+
+.grid {
+  display: grid;
+  grid-auto-columns: minmax(1px,auto);
+  grid-template-rows: 0px 7px;
+  border: 2px solid black;
+  float: left;
+  margin-right: 20px;
+}
+
+.grid :last-child { background:grey; }
+.grid :nth-child(2) { background:pink; }
+
+x { background: lime; height:7px; }
+
+  </style>
+</head>
+<body>
+
+<script>
+document.body.style.display = "none";
+var justify = [
+   "start",
+   // "end",
+   // "center",
+   // "start",
+   // "end",
+   "start",
+   "start",
+   "start",
+   "start",
+   "end",
+   "center",
+   "start",
+   // "end",
+   // "start",
+   // "end safe",
+   // "end",
+   "center",
+   // "center",
+   // "end",
+   // "end safe",
+   // "start",
+   "center",
+   // "end",
+   // "end safe",
+   // "left",
+   // "end",
+];
+var cols = [ "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" ];
+var widths = [ "0", "1", "2", "3", "4", "5", "6" ];
+for (var j = 0; j < justify.length; ++j) {
+  // document.body.appendChild(document.createTextNode(justify[j])); // for debugging
+  var chunk = document.createElement('div');
+  chunk.setAttribute("style", "border:1px solid; padding:2px 10px; overflow:hidden");
+  for (var c = 0; c < cols.length; ++c) {
+    for (var w = 0; w < widths.length; ++w) {
+     // set this to true if you want to see all tests
+     var run_test = widths[w] < cols[c] || cols[c] == 0 || cols[c] == 1;
+     if (run_test) {
+      var grid = document.createElement('div');
+      grid.style.width = widths[w]+"px";
+      grid.className = "grid";
+      grid.style.justifyContent = justify[j];
+      var span = document.createElement('span');
+      span.style.gridColumn = "1 / span " + cols[c];
+      grid.appendChild(span);
+      for (var x = 0; x < cols[c]; ++x) {
+        grid.appendChild(document.createElement('x'));
+      }
+      // if (j < 5) { // The stretch tests.
+      if (j < 1) { // The stretch test.
+        if (c == 1)
+          grid.style.background = 'pink'
+      }
+      // if (j == 6 && cols[c] == 1) { // The 'safe end' tests.
+      if (j == 2 && cols[c] == 1) { // The 'safe end' tests.
+        if (widths[w] != 0) grid.style.justifyContent = 'end';
+      }
+      // if (j == 7 && cols[c] == 1) { // The 'safe center' tests.
+      if (j == 3 && cols[c] == 1) { // The 'safe center' tests.
+        if (widths[w] != 0) grid.style.justifyContent = 'center';
+      }
+      // if (j > 15) { // The space-around and space-evenly tests.
+      if (j > 7) { // The space-around and space-evenly tests.
+        if (cols[c] == 1) {
+          if (widths[w] == 0) {
+            if (grid.style.justifyContent != 'end') {
+              grid.style.justifyContent = 'start';
+            }
+          } else {
+            grid.style.justifyContent = 'center';
+          }
+        }
+      }
+      chunk.appendChild(grid);
+     }
+    }
+  }
+  document.body.appendChild(chunk);
+}
+document.body.style.display = "";
+</script>
+
+</body>
+</html>