If you visit a D8 site as an authenticated user and add a query string parameter which includes a quotation mark, then a JavaScript error will be thrown.
E.g. go to /search?keywords=it's
Error:Uncaught DOMException: Failed to execute 'querySelectorAll' on 'Document': '[data-drupal-link-system-path="search"]:not([hreflang])[data-drupal-link-query='{"keywords":"it's"}'],[data-drupal-link-system-path="search"][hreflang="en"][data-drupal-link-query='{"keywords":"it's"}']' is not a valid selector.
This does not effect anonymous users as the core/drupal.active-link library is only attached if the current user is authenticated.