Syntax error, unrecognized expression for href

Question

When I add below script and run. I am getting this:

Uncaught Error: Syntax error, unrecognized expression: ul li a[href=#!id1]

Answer 1

you may add the below code in functions.php

function modify_jquery() {
if (!is_admin()) {
	wp_deregister_script('jquery');
	wp_register_script('jquery', 'https://code.jquery.com/jquery-1.11.3.min.js');
	wp_enqueue_script('jquery');
}
}
add_action('init', 'modify_jquery');