n enum of allowed values like ("normal", "italic"...)</li>
  <li><strong>Border style/stroke style:</strong> maybe an enum (solid, dashed, dotted, etc.) and/or a way to specify dash &amp; gap lengths?</li>
  <li><strong>Duration:</strong> a time duration, in seconds or milliseconds, e.g. for animations, delays, etc.</li>
  <li><strong>Percentage/ratio:</strong> e.g. for opacity values, relative dimensions, aspect ratios, etc.<ul>
  <li>Not 100% sure about this since these are really "just" numbers. An alter