See The HTML autocomplete attribute for more about the autocomplete field names and how autocomplete works. Each form control within new-entry's Document that has autocomplete configured with its autofill field name set to off is reset.If new-entry has a different Document object than current-entry, the browsing context is updated so that its document property refers to the document referred to by new-entry, and the context's name is updated to match the context name of the now-current document.The entry is now said to have "persisted user state." This information the browser might add to the history session entry may include, for instance, the document's scroll position, the values of form inputs, and other such data. If the browser has state information it wishes to store with the current-entry before navigating away from it, it then does so.If current-entry's title wasn't set using one of the History API methods ( pushState() or replaceState()), set the entry's title to the string returned by its document.title attribute.This will eventually send events such as DOMContentLoaded and load to the Window containing the document, but the steps below will continue to execute in the meantime. If new-entry doesn't currently contain an existing Document, fetch the content and create its Document before continuing.The current page's session history stack entry will be referred to as current-entry. Here, the transition is changing the current history entry to one we'll refer to as new-entry. To better understand when the popstate event is fired, consider this simplified sequence of events that occurs when the current history entry changes due to either the user navigating the site or the history being traversed programmatically. It happens after the new location has loaded (if needed), displayed, made visible, and so on - after the pageshow event is sent, but before the persisted user state information is restored and the hashchange event is sent. When a navigation occurs - either due to the user triggering the browser's Back button or otherwise - the popstate event is near the end of the process to navigate to the new location. This section describes the steps that browsers follow in the cases where they do potentially fire the popstate event (that is, in the cases where the page has been interacted with). It's important to first understand that - to combat unwanted pop-ups - browsers may not fire the popstate event at all unless the page has been interacted with.
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