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When i do something like :
$('#container').addClass("contract");
It only add class to the first div with id container
When i do something like :
$('.container').addClass("contract");
It adds the class to ALL the divs with class container
WHY ?
Every element ID must be unique. An ID points to one and only one attribute. Jquery or any other framework would not even consider that you might have more than one element with a particular id. All your elements need to have a different id. Javascript and the DOM expect this (document.getElementByID for example will return just one element, and might now work at all if the ID is duplicated). Everything expects this.