">width</span>, </span> <span class="parameter" id="addPlaceholder-param-height"><span class="type-annotation"><a href="dart-core/double-class.html">double</a></span> <span class="parameter-name">height</span>, </span> <span class="parameter" id="addPlaceholder-param-alignment"><span class="type-annotation"><a href="dart-ui/PlaceholderAlignment-class.html">PlaceholderAlignment</a></span> <span class="parameter-name">alignment</span>, {</span> <span class="parameter" id="addPlaceholder-param-scale"><span cla