Web Reference: Dec 13, 2013 · The cash sign is just an alias for the jQuery function. Starting the variable name with $ has no effect on that variable. It is customary though, especially in jQuery plugin development, to use variables already wrapped in jQuery with a cash sign, so you know you can call jQuery methods, without having to wrap them. What are the possible reasons for document.getElementById, $("#id") or any other DOM method / jQuery selector not finding the elements? Example problems include: jQuery silently failing to bind an event handler jQuery "getter" methods (.val(), .html(), .text()) returning undefined A standard DOM method returning null resulting in any of several errors: Uncaught TypeError: Cannot set property ... JQuery | Sign In Forgot Password? Reset We will send a password reset link to your email address.
YouTube Excerpt: You can use vanilla javascript to change the background
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