Chrome back forward cache how to test is something web developers and website owners need to understand. When users navigate back and forth through your site, Chrome may serve pages from its back forward cache instead of loading them fresh. This can affect how your site behaves and it is worth knowing how to test for it.
Let me explain what the back forward cache is, why it matters, and how you can test whether your site works properly with it.
What Is the Back Forward Cache
The back forward cache, sometimes called bfcache, is a feature in Chrome that makes navigating between pages faster. When you visit a webpage and then navigate to another page, Chrome keeps the first page in memory. When you press the back button, instead of loading the page again from the server, Chrome restores the page from memory. This makes the navigation feel instant.
This feature is especially helpful for users who browse extensively, as it saves time and bandwidth. Pages that were previously viewed can be displayed again almost immediately. However, this convenience comes with some important considerations for developers.
Why the Back Forward Cache Matters for Your Website
The back forward cache can affect how your website functions in several ways. When Chrome restores a page from the cache, it does not run the normal page load sequence again. This means certain JavaScript code may not execute, timers may not fire as expected, and some browser events may not be triggered.
For example, if your website relies on JavaScript to track user behavior when a page loads, that code might not run when the page is served from the back forward cache. Similarly, if you have auto-playing videos or animations that start when a page loads, they might behave differently when restored from cache.
Some websites experience issues with the back forward cache. Audio or video might continue playing when it should have stopped. Form data might behave unexpectedly. Analytics scripts might not fire properly. These issues can affect user experience and also impact how you measure website performance.
How to Test If Your Site Works With Back Forward Cache
Testing whether your website works properly with the back forward cache is straightforward. You can do this using Chrome developer tools, which provide specific features to help you understand how your pages behave.
Open your website in Chrome and navigate to a page on your site. Then navigate to another page on your site, and press the back button to return to the first page. Watch carefully to see if the page displays instantly without the usual loading indicators.
To get more detailed information, open Chrome developer tools by pressing F12 or right-clicking and selecting inspect. Go to the application tab and look for the back forward cache section in the sidebar. This will show you whether a page was served from the cache and any issues that might have prevented caching.
You can also use the navigation API in the developer tools console. Type performance.getEntriesByType(“navigation”) to see detailed information about how the page was loaded, including whether it came from the back forward cache.
Checking for Common Issues
When testing, pay attention to a few common problem areas. First, check whether JavaScript executes properly when returning to a cached page. You can add console logs to your code to see whether they run when you navigate back.
Second, verify that any animations or videos behave correctly. Sometimes media that should pause when the user navigates away continues playing when the page is restored from cache.
Third, test any forms on your site. Make sure form data does not get duplicated or behave unexpectedly when navigating back and forward.
Fourth, check that analytics and tracking scripts work properly. Many analytics tools have specific settings to handle back forward cache correctly, so review their documentation to ensure you have the right configuration.
Solutions If You Find Problems
If testing reveals issues with the back forward cache, there are several approaches you can take. One option is to use the pageshow and pagehide events in JavaScript instead of relying on load events. These events fire regardless of whether the page is loaded fresh or restored from cache.
You can also use the persistforedisted property in the navigation API to tell Chrome not to cache specific pages. This is useful for pages where caching causes problems.
For issues with extensions or browser features that interact with pages, you might consider how your content works with tools like Tab Suspender Pro, which helps manage tab resources. Testing your site across different scenarios ensures users have a consistent experience regardless of how they navigate.
Regular Testing Is Worth It
The back forward cache is a valuable feature for users, and most websites work fine with it enabled. However, taking time to test your site ensures that users get the experience you intended. Regular testing helps you catch issues before they become problems for your visitors.
Remember to test not just on Chrome but also on other browsers that support the back forward cache, as behavior can vary slightly between browsers. Keep testing as you make changes to your site, since new features or updates might introduce unexpected interactions with caching behavior.
Tips from the team behind Tab Suspender Pro and the Zovo extension suite at zovo.one