children

Klicke auf die äußere Box

HTML

<div>
      <div></div>
      <div></div>
      <div></div>
</div>

Script

const div = document.querySelector( "body > div" );
div.addEventListener( "click", findChildren );
function findChildren ( evt )
{
    var allChilds = evt.currentTarget.children;
    for(let i = 0; i < allChilds.length; i++){
        allChilds[i].classList.toggle( 'selected' )
    } 
}