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diff --git a/testing/web-platform/tests/css/css-grid/subgrid/orthogonal-writing-mode-005-ref.html b/testing/web-platform/tests/css/css-grid/subgrid/orthogonal-writing-mode-005-ref.html
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+<!DOCTYPE HTML>
+<html><head>
+  <meta charset="utf-8">
+  <title>Reference: line names in orthogonal parent subgrid</title>
+  <link rel="author" title="Kurt Catti-Schmidt" href="mailto:kschmi@microsoft.com">
+  <style>
+    body {
+      font:10px monospace; padding:0; margin:0; line-height:0;
+    }
+
+    .grid {
+      display: inline-grid;
+      grid-auto-columns: 15px;
+      border: 1px solid;
+      vertical-align: bottom;
+    }
+
+    .subgrid {
+      display: grid;
+      grid-template-columns: subgrid;
+      grid-column: 3 / span 4;
+      background: grey;
+    }
+    .grid > .subgrid > .subgrid {
+      writing-mode: vertical-lr;
+      grid-template-rows: subgrid;
+      grid-template-columns: initial;
+      grid-column: 1 / span 4;
+      grid-auto-columns: 8px;
+      grid-auto-flow: column;
+    }
+
+    .fill-1a  { grid-template-columns: subgrid repeat(auto-fill, [y]) [z] [z] [z] [z] }  /* [y] [z] [z] [z] [z] */
+    .fill-1b  { grid-template-columns: subgrid [x] repeat(auto-fill, [y]) [z] [z] [z] }  /* [x] [y] [z] [z] [z] */
+    .fill-1c  { grid-template-columns: subgrid [x] [x] repeat(auto-fill, [y]) [z] [z] }  /* [x] [x] [y] [z] [z] */
+    .fill-1d  { grid-template-columns: subgrid [x] [x] [x] repeat(auto-fill, [y]) [z] }  /* [x] [x] [x] [y] [z] */
+    .fill-1e  { grid-template-columns: subgrid [x] [x] [x] [x] repeat(auto-fill, [y]) }  /* [x] [x] [x] [x] [y] */
+
+    .areas-1a { grid-template-areas: 'x x x x' }
+    .areas-1b { grid-template-areas: '. x x x' }
+    .areas-1c { grid-template-areas: 'x x x .' }
+    .areas-1d { grid-template-areas: '. . x x' }
+    .areas-1e { grid-template-areas: '. . x .' }
+
+    .subgrid > .subgrid > :nth-child(2n)   {  background: black; }
+    .subgrid > .subgrid > :nth-child(2n+1) {  background: pink; }
+    .subgrid > .subgrid > * { writing-mode: horizontal-tb; }
+
+    </style>
+  </head>
+  <body>
+
+  <!-- Line names before/after auto repeat -->
+  <div class="grid"><div class="subgrid fill-1a"><div class="subgrid">
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:3"></div>
+    <div style="grid-row:2"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:3"></div>
+    <div style="grid-row:2"></div>
+    <div style="grid-row:1"></div>
+  </div></div></div>
+
+  <div class="grid"><div class="subgrid fill-1b"><div class="subgrid">
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+  </div></div></div>
+
+  <div class="grid"><div class="subgrid fill-1c"><div class="subgrid">
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:2"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:2"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+  </div></div></div>
+
+  <div class="grid"><div class="subgrid fill-1d"><div class="subgrid">
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:3"></div>
+    <div style="grid-row:2"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:3"></div>
+    <div style="grid-row:2"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+  </div></div></div>
+
+  <div class="grid"><div class="subgrid fill-1e"><div class="subgrid">
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:3"></div>
+    <div style="grid-row:2"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:3"></div>
+    <div style="grid-row:2"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+  </div></div></div>
+
+  <div class="grid"><div class="subgrid fill-1a"><div class="subgrid">
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+  </div></div></div>
+
+  <!-- Auto repeat line names -->
+  <div class="grid"><div class="subgrid fill-1b"><div class="subgrid">
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:2"></div>
+    <div style="grid-row:2"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+  </div></div></div>
+
+  <div class="grid"><div class="subgrid fill-1c"><div class="subgrid">
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:3"></div>
+    <div style="grid-row:3"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+  </div></div></div>
+
+  <div class="grid"><div class="subgrid fill-1d"><div class="subgrid">
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+  </div></div></div>
+
+  <div class="grid"><div class="subgrid fill-1e"><div class="subgrid">
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+  </div></div></div>
+
+  <div class="grid"><div class="subgrid fill-1a"><div class="subgrid">
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:3"></div>
+    <div style="grid-row:2"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:3"></div>
+    <div style="grid-row:2"></div>
+    <div style="grid-row:1"></div>
+  </div></div></div>
+
+  <div class="grid"><div class="subgrid fill-1b"><div class="subgrid">
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:3"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:3"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+  </div></div></div>
+
+  <div class="grid"><div class="subgrid fill-1c"><div class="subgrid">
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+  </div></div></div>
+
+  <div class="grid"><div class="subgrid fill-1d"><div class="subgrid">
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+  </div></div></div>
+
+  <div class="grid"><div class="subgrid fill-1e"><div class="subgrid">
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:4"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1"></div>
+  </div></div></div>
+
+  <!-- Named grid areas -->
+  <div class="grid"><div class="subgrid areas-1a"><div class="subgrid">
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1 / -1"></div>
+    <div style="grid-row:1 / -1"></div>
+    <div style="grid-row:-1"></div>
+  </div></div></div>
+
+  <div class="grid"><div class="subgrid areas-1b"><div class="subgrid">
+    <div style="grid-row:2"></div>
+    <div style="grid-row:2 / -1"></div>
+    <div style="grid-row:2 / -1"></div>
+    <div style="grid-row:-1"></div>
+  </div></div></div>
+
+  <div class="grid"><div class="subgrid areas-1c"><div class="subgrid">
+    <div style="grid-row:1"></div>
+    <div style="grid-row:1/-2"></div>
+    <div style="grid-row:1/-2"></div>
+    <div style="grid-row:-2"></div>
+  </div></div></div>
+
+  <div class="grid"><div class="subgrid areas-1d"><div class="subgrid">
+    <div style="grid-row:3"></div>
+    <div style="grid-row:3 / -1"></div>
+    <div style="grid-row:3 / -1"></div>
+    <div style="grid-row:-1"></div>
+  </div></div></div>
+
+  <div class="grid"><div class="subgrid areas-1e"><div class="subgrid">
+    <div style="grid-row:3"></div>
+    <div style="grid-row:3"></div>
+    <div style="grid-row:3"></div>
+    <div style="grid-row:-1"></div>
+  </div></div></div>
+  </body>
+  </html>