JavaScript detection is a technique used to determine whether JavaScript is enabled or disabled in a web browser. This is important because JavaScript is a programming language that can add interactivity and dynamic functionality to web pages. If JavaScript is disabled, certain features and functions of a web page may not work properly.
There are several methods that can be used to check if JavaScript is enabled in a web browser. One common method is to use the window.alert() function. This function displays an alert box with a specified message. If the window.alert() function is called and an alert box is displayed, then JavaScript is enabled.