There is need to update HTMLForm Documentation. HTMLForm is like feature Documentation for creating Special Page.
There is much class which needs to Documentation. Like
[] 'api' => HTMLApiField::class,
[] 'textwithbutton' => HTMLTextFieldWithButton::class
[] 'combobox' => HTMLComboboxField::class,
[] 'limitselect' => HTMLSelectLimitField::class
[] 'toggle' => HTMLCheckField::class
[] 'namespaceselect' => HTMLSelectNamespace::class,
[] 'namespaceselectwithbutton' => HTMLSelectNamespaceWithButton::class,
[x] 'tagfilter' => HTMLTagFilter::class,
[x] 'sizefilter' => HTMLSizeFilterField::class
[] 'edittools' => HTMLEditTools::class,
[] 'cloner' => HTMLFormFieldCloner::class,
[] 'autocompleteselect' => HTMLAutoCompleteSelectField::class,
[] 'date' => HTMLDateTimeField::class,
[] 'time' => HTMLDateTimeField::class,
[] 'datetime' => HTMLDateTimeField::class,
[] 'email' => HTMLTextField::class,
[] 'url' => HTMLTextField::class,
[] 'title' => HTMLTitleTextField::class,
[] 'user' => HTMLUserTextField::class,
[x] 'usersmultiselect' => HTMLUsersMultiselectField::class,
Links:- https://www.mediawiki.org/wiki/HTMLForm/tutorial3