How many links on the page will work with Enhanced Link Attribution in Google Analytics?

how-many-links-will-work-with-GA-ELA.js

(function(){
    function hasId(elem) {
        return !!elem.id && elem.id.length > 0
    }

    function ancestorsHaveNoId(elem) {
        return !(hasId(elem) || hasId(elem.parentNode) || hasId(elem.parentNode.parentNode))
    }
    
    let links = [].slice.call(document.querySelectorAll('a'));

    let fails = links.filter(ancestorsHaveNoId);

    console.info('# of links:', links.length);
    console.info('# of failed links:', fails.length);

    console.log(fails);
})()

how-many-links-will-work-with-GA-ELA.md

How many links have IDs within 2 ancestors?

Analytics tries to identify exactly which elements on the page users clicked. If an element has a unique ID, then Analytics is able to identify the number of clicks on that element. If an element does not have a unique ID, then Analytics looks up to three levels higher in the DOM structure for a unique ID (i.e., the element's parent's parent). If Analytics is still unable to find a unique ID, then you see a range.

https://support.google.com/analytics/answer/2558867?hl=en