detecting css change javascript code example

Example 1: js html textbox on change

<!-- 
	You can use any of the following:
	onkeydown, onkeyup or onchange
 -->

<input type="text" onkeydown="keydownFunction()" 
onkeyup="keyupFunction()" onchange="changeFunction()">

Example 2: event from changed style

var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(mutationRecord) {
    console.log('style changed!');
   });    
 });

 var target = document.getElementById('myId');
  observer.observe(target, { attributes : true, attributeFilter : ['style'] });