Fairfield City Council
Insights
Google Lighthouse Performance
The Google Lighthouse performance score is a metric that measures the speed and performance of a website. It’s an overall score that ranges from 0 to 100 and is generated based on a number of different performance metrics, such as the time it takes for a website to load, the time it takes for a website to become interactive, the size of the resources used by the website, and other factors that impact the user experience.
A high performance score in Google Lighthouse indicates that a website is fast and responsive, which can lead to a better user experience and improved search engine rankings. On the other hand, a low performance score can indicate that a website is slow and unresponsive, and can negatively impact the user experience.
- Mobile Performance
- 45%
- Desktop Performance
- 56%
Core Web Vitals
Core Web Vitals are a set of specific factors that Google considers important in a webpage’s overall user experience. Core Web Vitals are made up of three specific page speed and user interaction measurements: Largest Contentful Paint, First Input Delay, and Cumulative Layout Shift.
Pass or fail?
| Mobile | Fail |
|---|---|
| Desktop | Fail |
CWV Breakdown
| Vital | Mobile | Desktop | Target |
|---|---|---|---|
| Largest Contentful Paint | 18.0 s | 9.6 s | < 2.5 s |
| First Input Delay | 500 ms | 80 ms | < 100ms |
| Cumulative Layout Shift | 0 | 0 | 0.1 |
Tracking scripts
All the tracking scripts on the site generated ~432 KB of data
A tracking script is a code snippet designed to track the flow of visitors who visit a website. Media, advertising, and analytics organisations will provide a script to add to your website that sends data directly to their servers. This data can then be used to measure goals and conversions, analyse user behaviour, and influence advertising campaigns.
Consider how much of this data you actually need and use? How often do you review the analytics data, and does this inform genuine change? Are you actively running social media campaigns? Consider pausing or removing tracking scripts that aren’t being actively used.
View details
| googletagmanager.com | 3 | 212 KB |
| connect.facebook.net | 2 | 169 KB |
| google-analytics.com | 3 | 21 KB |
| facebook.com | 2 | 656 B |
| js-agent.newrelic.com | 1 | 28 KB |
| bam.nr-data.net | 2 | 756 B |
Opportunities
Optimise images685 KB0.153g
By optimising the following images, roughly 685 KB could be removed from the transfer size, about 32%. This would reduce the CO2 generated per page load from 0.47g grams to 0.32 grams.
Images should be optimised for the web for several reasons:
- Reduced file size: Optimizing images can result in a smaller file size, which can help to reduce the amount of data that needs to be downloaded. This can lead to faster page load times and improved performance.
- Improved user experience: Optimising images can help to improve the overall user experience, as pages with optimised images load faster and are more responsive.
- Lower emissions: Optimising images can help to reduce the emissions associated with data transfer, as less data needs to be transmitted over the network.
- Better accessibility: Optimising images can make them more accessible to users with slower connections or limited data plans.
View details
| 2023-Cabramatta-Moon-Festival-hosted-by-Fairfield-City-Council-Sydney-event.jpg | 298 KB | 14% | 146 KB |
| gas-stove.png | 195 KB | 9% | 184 KB |
| adobestock_223761735-dog-1000.jpg | 79 KB | 4% | 48 KB |
| 20220827_fairfield_moonfestival_lowres-126.jpg | 62 KB | 3% | 35 KB |
| cabravale-parks.png | 61 KB | 3% | 49 KB |
| mayors-christmas-appeal-article.jpg | 55 KB | 3% | 32 KB |
| cabramatta-moon-festival-2023-badge-landscape.jpg | 50 KB | 2% | 30 KB |
| adobestock_328784632.jpg | 50 KB | 2% | 28 KB |
| 2024-australia-day-nominations-open-fairfield-city-council.jpg | 43 KB | 2% | 27 KB |
| mainimage.jpg | 40 KB | 2% | 23 KB |
| dsc_02741.jpg | 37 KB | 2% | 22 KB |
| lgweekcropped-2.jpg | 36 KB | 2% | 22 KB |
| adobestock_268042523-1500-mirror.jpg | 28 KB | 1% | 16 KB |
| awel-tile.png | 20 KB | 1% | 15 KB |
| png;base64,iVBORw0KGgoAAAANSUhEUgAAAPoAAAD6CAYAAACI7Fo9AAAAAXNSR0IArs4c6QAAIABJREFUeF7tX… | 0 B | 0% | 9 KB |
Replace jQuery and jQuery libraries with more modern code34 KB0.01g
jQuery is a popular and widely-used JavaScript library that simplifies web development by providing a set of tools and functions to interact with HTML documents, handle events, create animations, and make asynchronous HTTP requests.
In the past, jQuery was a very popular choice for web development because it simplified many common tasks and provided a consistent and cross-browser-compatible API. However, with the advancement of modern web technologies and improvements in browser capabilities, the need for jQuery has decreased.
Many modern web frameworks and libraries, such as React and Angular, provide their own set of tools for handling common tasks and interacting with the DOM, making jQuery less necessary in many cases. The Javascript engine in modern browsers have also become more consistent in the feature implementations often eliminating the need for a library like jQuery.
jQuery represents an opportunity because:
- Performance: While jQuery is a powerful and useful library, it can slow down website performance due to its large size and complex code. Modern browsers have also improved their native support for many of the features that jQuery provides, reducing the need for it.
- Maintainability: jQuery code can be difficult to maintain and update, particularly as web technologies evolve and change. This can make it harder for developers to keep up with best practices and standards for web development.
- Accessibility: Some jQuery plugins and features can create accessibility issues, particularly for users who rely on assistive technologies. This can make it harder for people with disabilities to use and access websites.
View details
| jquery.min.js | 34 KB |
First Contentful Paint
First Contentful Paint (FCP) is a performance metric that measures the time it takes for the first piece of content to be rendered on the screen when a user navigates to a web page. This content can be any visual element on the page, such as text, images, or a background color.
FCP is important because it directly affects the perceived speed of a website, and can impact user engagement and conversion rates. A faster FCP can lead to a better user experience and improved performance.
Here are a few ways you can optimise your FCP:
- Optimise images: Large, unoptimised images can slow down a page’s FCP. You can optimise images by compressing them, reducing their dimensions, and choosing the right format for each image.
- Minimise HTTP requests: Each resource requested by a web page, such as images, scripts, and stylesheets, requires a separate HTTP request. Minimising the number of HTTP requests can help to reduce the time it takes for a page to render.
- Prioritize critical content: Prioritizing critical content, such as above-the-fold content, can help to ensure that users see something on the screen quickly, even if the rest of the page is still loading.
- Reduce server response time: A slow server response time can significantly impact FCP. Optimizing server-side code and server settings can help to reduce response times and improve FCP.
- Use a performance monitoring tool: There are many tools available that can help you monitor your website’s performance, including FCP. These tools can help you identify performance issues and track your progress as you implement optimizations.
| Mobile | Desktop | |
|---|---|---|
| Score | 8% | 4% |
| Timing | 5.2 s | 3.3 s |
Largest Contentful Paint
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn more about the Largest Contentful Paint metric
| Mobile | Desktop | |
|---|---|---|
| Score | 0% | 0% |
| Timing | 18.0 s | 9.6 s |
Total Blocking Time
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more about the Total Blocking Time metric.
| Mobile | Desktop | |
|---|---|---|
| Score | 59% | 100% |
| Timing | 490 ms | 50 ms |
Speed Index
Speed Index shows how quickly the contents of a page are visibly populated. Learn more about the Speed Index metric.
| Mobile | Desktop | |
|---|---|---|
| Score | 10% | 4% |
| Timing | 9.8 s | 4.8 s |
Time to Interactive
Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.
| Mobile | Desktop | |
|---|---|---|
| Score | 15% | 34% |
| Timing | 12.3 s | 5.5 s |
Max Potential First Input Delay
The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.
| Mobile | Desktop | |
|---|---|---|
| Score | 8% | 98% |
| Timing | 500 ms | 80 ms |
First Meaningful Paint
First Meaningful Paint measures when the primary content of a page is visible. Learn more about the First Meaningful Paint metric.
| Mobile | Desktop | |
|---|---|---|
| Score | 25% | 4% |
| Timing | 5.2 s | 3.3 s |
Eliminate render-blocking resources
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. Learn how to eliminate render-blocking resources.
| Mobile | Desktop | |
|---|---|---|
| Score | 25% | 33% |
| Insight | Potential savings of 2,350 ms | Potential savings of 1,720 ms |
Reduce unused CSS
Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.
| Mobile | Desktop | |
|---|---|---|
| Score | 51% | 81% |
| Insight | Potential savings of 91 KiB | Potential savings of 91 KiB |
Reduce unused JavaScript
Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.
| Mobile | Desktop | |
|---|---|---|
| Score | 38% | 85% |
| Insight | Potential savings of 450 KiB | Potential savings of 428 KiB |
Efficiently encode images
Optimized images load faster and consume less cellular data. Learn how to efficiently encode images.
| Mobile | Desktop | |
|---|---|---|
| Score | 58% | 100% |
| Insight | Potential savings of 98 KiB | Potential savings of 73 KiB |
Serve images in next-gen formats
Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. Learn more about modern image formats.
| Mobile | Desktop | |
|---|---|---|
| Score | 13% | 76% |
| Insight | Potential savings of 882 KiB | Potential savings of 685 KiB |
Initial server response time was short
Keep the server response time for the main document short because all other requests depend on it. Learn more about the Time to First Byte metric.
| Mobile | Desktop | |
|---|---|---|
| Grade | Fail | Pass |
| Insight | Root document took 850 ms | Root document took 530 ms |
Avoid multiple page redirects
Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.
| Mobile | Desktop | |
|---|---|---|
| Score | 38% | 57% |
| Insight | Potential savings of 1,430 ms | Potential savings of 720 ms |
Preload Largest Contentful Paint image
If the LCP element is dynamically added to the page, you should preload the image in order to improve LCP. Learn more about preloading LCP elements.
| Mobile | Desktop | |
|---|---|---|
| Score | 74% | 56% |
| Insight | Potential savings of 370 ms | Potential savings of 740 ms |
Avoids enormous network payloads
Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.
| Mobile | Desktop | |
|---|---|---|
| Score | 95% | 98% |
| Insight | Total size was 2,386 KiB | Total size was 2,121 KiB |
Serve static assets with an efficient cache policy
A long cache lifetime can speed up repeat visits to your page. Learn more about efficient cache policies.
| Mobile | Desktop | |
|---|---|---|
| Score | 14% | 15% |
| Insight | 39 resources found | 40 resources found |
Avoid an excessive DOM size
A large DOM will increase memory usage, cause longer style calculations, and produce costly layout reflows. Learn how to avoid an excessive DOM size.
| Mobile | Desktop | |
|---|---|---|
| Score | 56% | 56% |
| Insight | 1,306 elements | 1,308 elements |
JavaScript execution time
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.
| Mobile | Desktop | |
|---|---|---|
| Score | 72% | 100% |
| Timing | 2.2 s | 0.5 s |
Minimizes main-thread work
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work
| Mobile | Desktop | |
|---|---|---|
| Score | 53% | 99% |
| Timing | 3.8 s | 1.1 s |
Image elements do not have explicit width and height
Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions
| Mobile | Desktop | |
|---|---|---|
| Grade | Fail | Fail |
Insights
Carbon footprint
The carbon footprint of a website can be calculated by estimating the amount of energy consumed by the data center hosting the website, as well as the energy consumed by users accessing the site. Factors that can influence a website’s carbon footprint include the size of the site, the amount of traffic it receives, and the technology and hosting infrastructure used to host the site.
| Mobile | Desktop | |
|---|---|---|
| Grade | F | E |
| Green Hosting | Yes | Yes |
| Dirtier than | 59% | 55% |
| CO2 per page load | 0.53g | 0.47g |
| CO2 wasted per page load | ~0.2g | ~0.2g |
| Transfer size | 2.33MB | 2.07MB |
| Transfer size percentile | 55% | 46% |
| Size wasted | 960.25 KB | 684.50 KB |
Sustainable hosting
By hosting this site on a server powered by renewable energy, this page generated ~0.47grams of CO2 instead of ~0.55grams of CO2.
Sustainable web hosting refers to hosting services that are designed to minimise their impact on the environment and to promote sustainability. This can include using renewable energy sources, reducing waste and emissions, and implementing best practices for energy efficiency.
Sustainable web hosting providers aim to reduce their carbon footprint by using energy-efficient server hardware, data centres, and networking equipment, as well as implementing environmentally friendly policies and practices. For example, some providers may use renewable energy sources, such as wind or solar power, to power their data centres, or they may use high-efficiency cooling systems to reduce energy consumption.
Tracking scripts
All the tracking scripts on the site generated ~432 KB of data
A tracking script is a code snippet designed to track the flow of visitors who visit a website. Media, advertising, and analytics organisations will provide a script to add to your website that sends data directly to their servers. This data can then be used to measure goals and conversions, analyse user behaviour, and influence advertising campaigns.
Consider how much of this data you actually need and use? How often do you review the analytics data, and does this inform genuine change? Are you actively running social media campaigns? Consider pausing or removing tracking scripts that aren’t being actively used.
View details
| googletagmanager.com | 3 | 212 KB |
| connect.facebook.net | 2 | 169 KB |
| google-analytics.com | 3 | 21 KB |
| facebook.com | 2 | 656 B |
| js-agent.newrelic.com | 1 | 28 KB |
| bam.nr-data.net | 2 | 756 B |
Opportunities
Optimise images685 KB0.153g
By optimising the following images, roughly 685 KB could be removed from the transfer size, about 32%. This would reduce the CO2 generated per page load from 0.47g grams to 0.32 grams.
Images should be optimised for the web for several reasons:
- Reduced file size: Optimizing images can result in a smaller file size, which can help to reduce the amount of data that needs to be downloaded. This can lead to faster page load times and improved performance.
- Improved user experience: Optimising images can help to improve the overall user experience, as pages with optimised images load faster and are more responsive.
- Lower emissions: Optimising images can help to reduce the emissions associated with data transfer, as less data needs to be transmitted over the network.
- Better accessibility: Optimising images can make them more accessible to users with slower connections or limited data plans.
View details
| 2023-Cabramatta-Moon-Festival-hosted-by-Fairfield-City-Council-Sydney-event.jpg | 298 KB | 14% | 146 KB |
| gas-stove.png | 195 KB | 9% | 184 KB |
| adobestock_223761735-dog-1000.jpg | 79 KB | 4% | 48 KB |
| 20220827_fairfield_moonfestival_lowres-126.jpg | 62 KB | 3% | 35 KB |
| cabravale-parks.png | 61 KB | 3% | 49 KB |
| mayors-christmas-appeal-article.jpg | 55 KB | 3% | 32 KB |
| cabramatta-moon-festival-2023-badge-landscape.jpg | 50 KB | 2% | 30 KB |
| adobestock_328784632.jpg | 50 KB | 2% | 28 KB |
| 2024-australia-day-nominations-open-fairfield-city-council.jpg | 43 KB | 2% | 27 KB |
| mainimage.jpg | 40 KB | 2% | 23 KB |
| dsc_02741.jpg | 37 KB | 2% | 22 KB |
| lgweekcropped-2.jpg | 36 KB | 2% | 22 KB |
| adobestock_268042523-1500-mirror.jpg | 28 KB | 1% | 16 KB |
| awel-tile.png | 20 KB | 1% | 15 KB |
| png;base64,iVBORw0KGgoAAAANSUhEUgAAAPoAAAD6CAYAAACI7Fo9AAAAAXNSR0IArs4c6QAAIABJREFUeF7tX… | 0 B | 0% | 9 KB |
Replace jQuery and jQuery libraries with more modern code34 KB0.01g
jQuery is a popular and widely-used JavaScript library that simplifies web development by providing a set of tools and functions to interact with HTML documents, handle events, create animations, and make asynchronous HTTP requests.
In the past, jQuery was a very popular choice for web development because it simplified many common tasks and provided a consistent and cross-browser-compatible API. However, with the advancement of modern web technologies and improvements in browser capabilities, the need for jQuery has decreased.
Many modern web frameworks and libraries, such as React and Angular, provide their own set of tools for handling common tasks and interacting with the DOM, making jQuery less necessary in many cases. The Javascript engine in modern browsers have also become more consistent in the feature implementations often eliminating the need for a library like jQuery.
jQuery represents an opportunity because:
- Performance: While jQuery is a powerful and useful library, it can slow down website performance due to its large size and complex code. Modern browsers have also improved their native support for many of the features that jQuery provides, reducing the need for it.
- Maintainability: jQuery code can be difficult to maintain and update, particularly as web technologies evolve and change. This can make it harder for developers to keep up with best practices and standards for web development.
- Accessibility: Some jQuery plugins and features can create accessibility issues, particularly for users who rely on assistive technologies. This can make it harder for people with disabilities to use and access websites.
View details
| jquery.min.js | 34 KB |
Insights
Google Lighthouse Accessibility
The accessibility score in Google Lighthouse is a metric that measures how well a website is designed for users with disabilities. The score ranges from 0 to 100, with higher scores indicating better accessibility.
Google Lighthouse evaluates a website’s accessibility based on a number of different factors, such as the presence of alternative text for images, the use of semantic HTML, the ability to navigate the page using only a keyboard, and the use of appropriate color contrasts.
A high accessibility score in Google Lighthouse indicates that a website is well-designed for users with disabilities and provides an inclusive user experience. On the other hand, a low accessibility score can indicate that a website has barriers that make it difficult or impossible for some users to access and use the content.
In automated testing, this page scored 80% for accessibility on desktop. Keep in mind that automated accessibility testing is not perfect and that manual tests, use case testing, or usability testing should be completed as well.
- Mobile Accessibility
- 95%
- Desktop Accessibility
- 95%
Opportunities
Heading elements are not in a sequentially-descending order
Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.
| Mobile | Desktop | |
|---|---|---|
| Grade | Fail | Fail |
Elements with visible text labels do not have matching accessible names.
Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.
| Mobile | Desktop | |
|---|---|---|
| Grade | Fail | Fail |
Insights
Google Lighthouse Best Practices
Google Lighthouse evaluates a website’s best practices based on a number of different factors, such as the use of HTTPS encryption, the use of efficient caching policies, the implementation of modern web technologies, and the avoidance of deprecated technologies.
A high best practices score in Google Lighthouse indicates that a website is well-designed and follows best practices for web development, which can lead to better performance, security, and accessibility. On the other hand, a low best practices score can indicate that a website has room for improvement in terms of following best practices.
- Mobile Best Practices
- 73%
- Desktop Best Practices
- 73%
Google Lighthouse SEO
Google Lighthouse evaluates a website’s SEO based on a number of different factors, such as the presence of title and description tags, the use of header tags, the presence of structured data, the use of image alt tags, and the use of crawlable links.
A high SEO score in Google Lighthouse indicates that a website is well-optimized for search engines, which can help to improve its visibility in search results and increase its organic traffic. On the other hand, a low SEO score can indicate that a website has room for improvement in terms of its optimization for search engines.
While a high SEO score can help to improve a website’s visibility in search results, it’s not a guarantee of higher rankings, as search engine algorithms take many other factors into account when determining the ranking of a website.
- Mobile SEO
- 93%
- Desktop SEO
- 92%
Google Lighthouse PWA
The Progressive Web App (PWA) score in Google Lighthouse is a metric that measures the quality of a website as a progressive web app. The score ranges from 0 to 100, with higher scores indicating better performance and functionality as a PWA.
A progressive web app is a type of web application that combines the best features of both web and native apps, providing users with a fast, reliable, and engaging experience on any device.
Google Lighthouse evaluates a website’s PWA performance based on several key factors, such as the availability of a service worker, the presence of a web app manifest, the ability to install the app on the home screen, and the performance of the app under poor network conditions.
- Mobile PWA
- 63%
- Desktop PWA
- 57%
Tracking scripts
All the tracking scripts on the site generated ~432 KB of data
A tracking script is a code snippet designed to track the flow of visitors who visit a website. Media, advertising, and analytics organisations will provide a script to add to your website that sends data directly to their servers. This data can then be used to measure goals and conversions, analyse user behaviour, and influence advertising campaigns.
Consider how much of this data you actually need and use? How often do you review the analytics data, and does this inform genuine change? Are you actively running social media campaigns? Consider pausing or removing tracking scripts that aren’t being actively used.
View details
| googletagmanager.com | 3 | 212 KB |
| connect.facebook.net | 2 | 169 KB |
| google-analytics.com | 3 | 21 KB |
| facebook.com | 2 | 656 B |
| js-agent.newrelic.com | 1 | 28 KB |
| bam.nr-data.net | 2 | 756 B |
Cost to load
| Price per GB (USD) | $3.12 |
|---|---|
| Price per GB (Local) | 3.12 USD |
| Price to load PPV (USD) | $0.007 |
| Price to load PPV (Local) | 0.007 USD |
2022 Mobile data pricing sourced from cable.co.uk
Opportunities
Security headers to set5/6
HTTP security headers are special HTTP headers that can be added to a website’s response to help improve its security. They are important because they can help to protect a website and its users from various security threats, such as cross-site scripting (XSS) attacks, cross-site request forgery (CSRF) attacks, and other types of malicious activity.
It’s important to note, however, that implementing HTTP security headers is just one aspect of a comprehensive security strategy, and that other measures, such as regular software updates, secure coding practices, and regular security audits, are also important for maintaining a secure website.
View details
It's important to note, however, that implementing HTTP security headers is just one aspect of a comprehensive security strategy, and that other measures, such as regular software updates, secure coding practices, and regular security audits, are also important for maintaining a secure website.
Switch to a privacy focussed analytics platform
Google Analytics collects data on website users and their behaviour, which can raise privacy concerns for some visitors. Website owners who use Google Analytics have access to a range of data points, including IP addresses, browser types, device information, and user behaviour on the site.
While Google Analytics does provide some tools to help website owners protect the privacy of their visitors, such as data retention controls and the ability to enable IP address anonymisation, it’s important for website owners to be transparent about the data they collect and how they use it. Website owners should also take steps to ensure that any third-party tools they use, including Google Analytics, comply with relevant privacy laws and regulations.
Additionally, some users may choose to block Google Analytics tracking using ad-blocking software or browser extensions that prevent tracking cookies from being set. This can impact the accuracy of website analytics, but website owners should respect the privacy preferences of their visitors and provide alternative means for users to access the site and its content.
The following alternatives to Google Analytics are privacy focussed, meaning they don’t compromise the visitors privacy for the sake of data collection and reporting.
robots.txt is not valid
If your robots.txt file is malformed, crawlers may not be able to understand how you want your website to be crawled or indexed. Learn more about robots.txt.
| Mobile | Desktop | |
|---|---|---|
| Grade | Fail | Fail |
| Insight | 802 errors found | 802 errors found |
Does not use HTTPS
All sites should be protected with HTTPS, even ones that don't handle sensitive data. This includes avoiding mixed content, where some resources are loaded over HTTP despite the initial request being served over HTTPS. HTTPS prevents intruders from tampering with or passively listening in on the communications between your app and your users, and is a prerequisite for HTTP/2 and many new web platform APIs. Learn more about HTTPS.
| Mobile | Desktop | |
|---|---|---|
| Grade | Fail | Fail |
| Insight | 1 insecure request found | 1 insecure request found |
Registers an unload listener
The unload event does not fire reliably and listening for it can prevent browser optimizations like the Back-Forward Cache. Use pagehide or visibilitychange events instead. Learn more about unload event listeners
| Mobile | Desktop | |
|---|---|---|
| Grade | Fail | Fail |