First commit.

sass/base/tables/_tables.scss

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+// Tables
+//
+// The `<table>` element displays tabular data in rows, columns, and cells.
+//
+// Markup: tables-table.twig
+//
+// Weight: 1
+//
+// Style guide: base.table
+
+table {
+  // Add vertical rhythm margins.
+  @include margin(1 0);
+  // Remove most spacing between table cells.
+  border-collapse: collapse;
+  border-spacing: 0;
+  // Prevent cramped-looking tables
+  width: 100%;
+}
+
+td,
+th {
+  // Remove most spacing between table cells.
+  padding: 0;
+}

sass/base/tables/tables-table.twig

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+<table class="{{modifier_class}}">
+  <caption>Optional table caption.</caption>
+  <thead>
+    <tr>
+      <th>#</th>
+      <th>First Name</th>
+      <th>Last Name</th>
+      <th>Username</th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr>
+      <td>1</td>
+      <td>Jane</td>
+      <td>Doe</td>
+      <td>jdoe</td>
+    </tr>
+    <tr>
+      <td>2</td>
+      <td>Jamie</td>
+      <td>Morgan</td>
+      <td>jmorgan</td>
+    </tr>
+    <tr>
+      <td>3</td>
+      <td>Jacob</td>
+      <td>Smith</td>
+      <td>jsmith</td>
+    </tr>
+  </tbody>
+  <tfoot>
+    <tr>
+      <th>#</th>
+      <th>First Name</th>
+      <th>Last Name</th>
+      <th>Username</th>
+    </tr>
+  </tfoot>
+</table>