We provide a "details" => "Details (closed)" wrapper element option because the "details" element by default is closed.
We can provide a "details_open" option, and then set the #open attribute to true when "details_open" is chosen.
This is the code that needs to change:
/**
* Gets the "wrapper_element" allowed options.
*
* @return array
* The "wrapper_element" options.
*/
protected function getWrapperElementOptions(): array {
return [
'container' => $this->t('Container'),
'fieldset' => $this->t('Fieldset'),
'details' => $this->t('Details (Closed)'),
];
}
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[#3540484] feat: Add a "details_open" wrapper element options to...