An extra security layer has been integrated against Cross-Site Scripting (XSS) attacks. It requires developers to specify dataType:”script” in the options of the $.ajax() and the $.get() methods. This prevents the possibility of an attack where the remote site delivers non-script content but furtherdecides to serve a malicious script. Since the jQuery.getScript() explicitly sets dataType:”script” , it is unaffected by this change.

$.ajax({ accepts: { mynewcustomtype: 'application/abc-some-custom-type' }, // how to deserialize a `mynewcustomtype` converters: { 'text mynewcustomtype': function(result) { // do things return newresult; } }, // Expect a `mynewcustomtype` back from server dataType: 'mynewcustomtype' }); 9. The Invalid Hash Mark

jQuery 3 throws a syntax error if a selector string consists of nothing but a hash-mark, such as jQuery(“#”) and .find(“#”) . In the older version, $(“#”) returned an empty collection and .find(“#”) threw an error.

8. New Method To Escape String

The new jQuery.escapeSelector() method allows you to escape any string or character that has a special meaning in a CSS selector. It is useful in cases where an ID or a class name characters with a special meaning in CSS, such as semicolon or dot.

For instance, if an element on the page has an id of “abc.xyz”, it can’t be selected with $(“abc.xyz”) because the selector is parsed as an element with id ‘abc’, which also has a class ‘xyz’. However, it can be selected with new method $(“#” + $.escapeSelector(“abc.xyz”)) .

7.

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