[html] Equal sized table cells to fill the entire width of the containing table

Just use percentage widths and fixed table layout:

<table>
<tr>
  <td>1</td>
  <td>2</td>
  <td>3</td>
</tr>
</table>

with

table { table-layout: fixed; }
td { width: 33%; }

Fixed table layout is important as otherwise the browser will adjust the widths as it sees fit if the contents don't fit ie the widths are otherwise a suggestion not a rule without fixed table layout.

Obviously, adjust the CSS to fit your circumstances, which usually means applying the styling only to a tables with a given class or possibly with a given ID.

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