front-matter-fields>Optional front matter fields</h2><p>However, Hugo supports many front matter fields and this page only covers those
implemented on istio.io.</p><p>The following table shows the most commonly used <strong>optional</strong> fields:</p><table><thead><tr><th>Field</th><th>Description</th></tr></thead><tbody><tr><td><code>linktitle</code></td><td>A shorter version of the title that is used for links to the page.</td></tr><tr><td><code>subtitle</code></td><td>A subtitle displayed below the mai