https://doc.wikimedia.org/oojs-ui/master/php/classOOUI_1_1SearchInputWidget.html
OOUI: OOUI\SearchInputWidget Class Reference
class referenceooui
https://www.mediawiki.org/wiki/OOUI/Widgets/Popups
OOUI/Widgets/Popups - MediaWiki
oouiwidgetspopupsmediawiki