Find javascript that is changing DOM element
Right click on DOM element > Break on > Attributes Modifications
Via #3 in https://elijahmanor.com/blog/7-chrome-tips-developers-designers-may-not-know
you can use :-
document.documentElement.addEventListener('DOMAttrModified', function(e){
if (e.attrName === 'style') {
console.log('prevValue: ' + e.prevValue, 'newValue: ' + e.newValue);
}
}, false);
Have a look at this :-
Event detect when css property changed using Jquery