per.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String">String</a></span></span></span><span class="qm-api-header-tags"></span></div></div></div></div><div class="qm-api-collapsible-content"><div class="qm-api-item-content"><div class="qm-api-description"><div class="qm-html-paragraph">The class to use for the button when the picker is active. </div></div></div></div></div><div class="qm-api-item qm-api-javascript-property qm-api-collapsible"><div class="qm-api-collapsible-heading"><div class="