In this example, we use JavaScript to "click" on the London button, to open the tab on page load.
https://www.glidedesign.com/wp-content/themes/twentytwenty/classes/index.html
https://pursimple.com/wp-content/uploads/2021/10/index.html
In this example, we use JavaScript to "click" on the London button, to open the tab on page load.