ust be specified and non-null when using this
alignment mode.</p>
                  
  <div>
            <span class="signature"><code>const PlaceholderAlignment(1)</code></span>
          </div>
        </dd>
        <dt id="baseline" class="constant">
          <span class="name ">baseline</span>
          <span class="signature">&#8594; const <a href="dart-ui/PlaceholderAlignment-class.html">PlaceholderAlignment</a></span>
                  </dt>
        <dd>
          <p>Match the baseline of the placeh