How can one run customized JavaScript code in a session of MATLAB Online?

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To run customized JavaScript code in a session of MATLAB Online, you can use the "web" function provided by MATLAB. You need to pass a string containing the JavaScript code as the first argument to the "web" function, and set the second argument to '-browser' to open the code in a new browser tab. Here is an example:

js_code = '<script>alert("Hello, World!");</script>';
web(js_code, '-browser');

This will open a new tab in your browser and show an alert message saying "Hello, World!". You can replace the "js_code" string with your customized JavaScript code.