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+<!doctype html>
+<script src='/resources/testharness.js'></script>
+<script src='/resources/testharnessreport.js'></script>
+<link rel='stylesheet' href='./support/base.css' />
+<link rel="help" href="https://drafts.csswg.org/css-tables-3/#missing-cells-fixup">
+<link rel="help" href="https://drafts.csswg.org/css-tables-3/#dimensioning-the-row-column-grid">
+<main>
+
+    <h1>HTML5 Table Formatting algorithm (row/column grid computation)</h1>
+    <p>Verifies how browsers deal with implicit tracks from which no cell does originate</p>
+
+    <hr/>
+    <p>This should be a 100px by 100px blue square:</p>
+    <p>The table grid is 1x1, so the table is not empty and follows step 3A of the table layout algorithm (which adds anonymous cell boxes)</p>
+    <p>The consecutive tracks were merged together because they are not all defined explicitely by a table-column or a table-row, and share the same set of cells</p>
+    <p>Two 25px border-spacing causes the addition of 50px (track is 50x50)</p>
+    <x-table style="background: blue; border-spacing: 25px">
+        <x-tr><x-td style="padding: 25px"></x-td></x-tr>
+    </x-table>
+
+    <hr/>
+    <p>This should be a 100px by 100px blue square:</p>
+    <p>The table grid is 1x1, so the table is not empty and follows step 3A of the table layout algorithm (which adds anonymous cell boxes)</p>
+    <p>The consecutive tracks were merged together because they are not all defined explicitely by a table-column or a table-row, and share the same set of cells</p>
+    <p>Two 25px border-spacing causes the addition of 50px (track is 50x50)</p>
+    <x-table style="background: blue; border-spacing: 25px">
+        <x-tr><x-td style="padding: 25px" rowspan=2 colspan=2></x-td></x-tr>
+    </x-table>
+
+    <hr/>
+    <p>This should be a 75px by 75px blue square:</p>
+    <p>The table grid is 2x2, so the table is not empty and follows step 3A of the table layout algorithm (which adds anonymous cell boxes)</p>
+    <p>The consecutive tracks were not merged together because they are all defined explicitely by a table-column or a table-row</p>
+    <p>Three 25px border-spacing causes the addition of 75px (tracks are 0x0)</p>
+    <x-table style="background: blue; border-spacing: 25px">
+        <x-col></x-col>
+        <x-col></x-col>
+        <x-tr><x-td style="padding: 0px" rowspan=2 colspan=2></x-td></x-tr>
+        <x-tr></x-tr>
+    </x-table>
+
+    <hr/>
+    <p>This should be a 100px by 100px blue square:</p>
+    <p>The table grid is 2x2, so the table is not empty and follows step 3A of the table layout algorithm (which adds anonymous cell boxes)</p>
+    <p>The consecutive tracks were not merged together because they are all defined explicitely by a table-column or a table-row</p>
+    <p>Three 25px border-spacing causes the addition of 75px (tracks are 12.5x12.5)</p>
+    <x-table style="background: blue; border-spacing: 25px">
+        <x-col></x-col>
+        <x-col></x-col>
+        <x-tr><x-td style="padding: 25px" rowspan=2 colspan=2></x-td></x-tr>
+        <x-tr></x-tr>
+    </x-table>
+
+</main>
+
+<script>
+    while(true) {
+        var xtd = document.querySelector('x-td[rowspan], x-td[colspan]'); if(!xtd) break;
+        var td = document.createElement('td'); for(var i = xtd.attributes.length; i--;) { td.setAttribute(xtd.attributes[i].name,xtd.attributes[i].value) }
+        xtd.parentNode.replaceChild(td,xtd);
+    }
+
+    document.body.onload = () => {
+        generate_tests(assert_equals, [
+            [
+                "Control test for table-cell padding and border-spacing, etc (width)",
+                document.querySelector("x-table:nth-of-type(1)").offsetWidth,
+                100
+            ],
+            [
+                "Control test for table-cell padding and border-spacing (height)",
+                document.querySelector("x-table:nth-of-type(1)").offsetHeight,
+                100
+            ],
+            [
+                "Anonymous consecutive columns spanned by the same set of cells are merged",
+                document.querySelector("x-table:nth-of-type(2)").offsetWidth,
+                100
+            ],
+            [
+                "Anonymous consecutive rows spanned by the same set of cells are merged",
+                document.querySelector("x-table:nth-of-type(2)").offsetHeight,
+                100
+            ],
+            [
+                "Explicitely-defined consecutive columns spanned by the same set of cells are not merged",
+                document.querySelector("x-table:nth-of-type(3)").offsetWidth,
+                75
+            ],
+            [
+                "Explicitely-defined consecutive rows spanned by the same set of cells are not merged",
+                document.querySelector("x-table:nth-of-type(3)").offsetHeight,
+                75
+            ],
+            [
+                "Explicitely-defined consecutive columns spanned by the same set of cells are not merged, and cells span across border-spacing",
+                document.querySelector("x-table:nth-of-type(4) x-col").getBoundingClientRect().width,
+                12.5
+            ],
+            [
+                "Explicitely-defined consecutive rows spanned by the same set of cells are not merged, and cells span across border-spacing",
+                document.querySelector("x-table:nth-of-type(4) x-tr").getBoundingClientRect().height,
+                12.5
+            ],
+        ])
+    }
+</script>