nl_tokens: https : // dom . spec . whatwg . org / #assign - slotables
pl_tokens: function assignSlotable ( slot ) { const slotables = findSlotable ( slot ) ; let shouldFireSlotChange = false ; if ( slotables . length !== slot . _assignedNodes . length ) { shouldFireSlotChange = true ; } else { for ( let i = 0 ; i < slotables . length ; i ++ ) { if ( slotables [ i ] !== slot . _assignedNodes [ i ] ) { shouldFireSlotChange = <mask> ; break ; } } } if ( shouldFireSlotChange ) { signalSlotChange ( slot ) ; } slot . _assignedNodes = slotables ; for ( const slotable of slotables ) { slotable . _assignedSlot = slot ; } }