span class="type-annotation"><a href="../../dart-core/String-class.html">String</a></span> <span class="parameter-name">tagName</span>, </span></li>
<li><span class="parameter" id="allowTagExtension-param-baseName"><span class="type-annotation"><a href="../../dart-core/String-class.html">String</a></span> <span class="parameter-name">baseName</span>, </span></li>
<li><span class="parameter" id="allowTagExtension-param-uriPolicy">{<span class="type-annotation"><a href="../../dart-html/UriPolicy-class.html">U