var jqry = document.createElement('script');
jqry.src = "https://code.jquery.com/jquery-3.3.1.min.js";
document.getElementsByTagName('head')[0].appendChild(jqry);
setTimeout(function() {
    jQuery.noConflict();
    $ = jQuery
    alert('applied color');
    setInterval(function() {
        $('body *').each(function() {

            if ($(this).css('font-size') == '16px' && $(this).clone() //clone the element
                .children() //select all the children
                .remove() //remove all the children
                .end() //again go back to selected element
                .text() != '') {
                $(this).css('background', 'pink')
            }
        })
    }, 2000)

}, 2000)