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lang-js
console.log()before$("#email").focus();above check the console, you will see that you're creating and infinite-loop by doing a.focusas thefocusinevent fires, resulting inmaximum call stack size exceedederror.$("#email")[0]is an abomination. You force jQuery to create an object... Then you use its[0], which is the same asdocument.getElementById("#email"). All more about this element that was added in the jQuery object, you disclose it. -- So that is syntaxically a "doh!"you disclose it.should have been readyou discard it.;)