What is the method to detect the browser's back button event that works across all web browsers?

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There is no universal method to detect the browser's back button event that works across all web browsers. Different browsers use different methods and events to detect back button clicks. However, one approach that can work across most modern browsers is to use the History API and listen for the onpopstate event. The onpopstate event is fired when the browser's history changes, including when the back button is clicked. By using the pushState method of the History API to add entries to the browser's history, you can create a custom history navigation and listen for the onpopstate event to detect when the user navigates back using the browser's back button.