outline-table-caption.html

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<!DOCTYPE html>

<style>

table { outline: 1px solid blue; border-collapse: collapse; }

.caption, .cell { width: 100px; height: 100px; padding: 0; text-align: left; vertical-align: top; }

.caption { background-color: yellow; }

.cell { background-color: lime; }

</style>

<table>

  <caption class="caption">Caption</caption>

  <tr><td class="cell">Cell</td></tr>

</table>