Seems the PHP on doc.wikimedia.org is not new enough for the OOUI demos.
Composer detected issues in your platform: Your Composer dependencies require a PHP version ">= 7.2.9".
Seems the PHP on doc.wikimedia.org is not new enough for the OOUI demos.
Composer detected issues in your platform: Your Composer dependencies require a PHP version ">= 7.2.9".