Chrome DevTools is a joint set of web developer tools built into the Google Chrome browser. It's a powerful toolkit that lets you inspect, edit, and debug your code and measure your pages' performance. In this guide, we'll go over how to use all of the features of DevTools to test and debug your web pages.
To get started with DevTools, open the Chrome browser and go to the URL you want to inspect. Then, right-click on any element on that page and select "Inspect Element." This will open up the DevTools panel.
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Select an element on the page to get started with the Elements panel. This will bring up the HTML for that element in the Elements panel. From here, you can edit the HTML or CSS for that element. Any changes you make will be immediately reflected on the page.
You can also generate new elements to your page with the Elements panel. To generate a new element, click the "Add Element" button at the panel's top. This shows a dialog box where you can enter the HTML for the new element. Once you've entered the HTML, click "OK" to add the element to your page.
To get started with the Console panel, enter some JavaScript into the Console and press "Enter." The Console will evaluate the code and print the result. You can also use the Console to debug your code. To do this, set a breakpoint in your code with the "debugger" keyword. When the code execution hits the breakpoint, the Console will pause and let you step through the code.
Select a file in the "Files" pane to get started with the Sources panel. This will bring up the contents of that file in the "Editor" pane. From here, you make changes to the code and see those changes immediately reflected on the page.
You can easily set breakpoints in your code with the Sources panel too. To set a breakpoint, click on the line number where you want to set the breakpoint. This will be showing a dialog where you can enter the breakpoint conditions. Once you've entered the breakpoint conditions, click "OK" to set the breakpoint.
Select a resource in the "Resources" pane to start with the Network panel. This will bring up the details of that resource in the "Details" pane. From here, you can see when the resource was loaded, how long it took to load, and what type of resource it was.
You can use the Network panel to throttle the network speed too. To throttle the network speed, click the "Network Throttling" button at the panel's top. This will show dialog box where you can select the desired connection speed. Once you've selected the connection speed, click "OK" to throttle the network.
Select a resource in the "Resources" pane to get started with the Performance panel. This will bring up the details of that resource in the "Details" pane. You can check how much time it is taking to load, what type of resource it is, and what size it is.
You can also use the Performance panel to record a performance profile. To record a performance profile, click the "Record" button at the panel's top. This will start recording information about your page's performance. Once you have finished recording then just click the "Stop" button to save the performance profile.
Select a resource in the "Resources" pane to get started with the Memory panel. This will bring up the details of that resource in the "Details" pane. From here, you can check how much of the memory the resource uses, what type of resource it is, and when it was last accessed.
You can also use the Memory panel to take a snapshot of your page's memory usage. To take a snapshot, click the "Take Snapshot" button at the top of the panel. This will save a copy of your page's current memory usage. Once you've taken a snapshot, you can browse through the snapshot to see what resources are taking up memory.
Select a resource in the "Resources" pane to get started with the Application panel. This will bring up the details of that resource in the "Details" pane. You can just see and check what files are being loaded and what cookies and local storage are being used.
You can also use the Application panel to clear your web application's data. To clear your web application's data, click the "Clear" button at the top of the panel. This will clear all of your web application's data, including cookies, local storage, and the browser cache.
Select a resource in the "Resources" pane to get started with the Security panel. This will bring up the details of that resource in the "Details" pane. From here, you can see what permissions your page has and what security vulnerabilities may be present.
You can also use the Security panel to change your web page's security settings. To change your web page's security settings, click the "Security" button at the top of the panel. This show a dialog where you can change your web page's security settings.
To get started with the Settings panel, click the "Settings" button at the top of the DevTools window. This will bring up the Settings panel. From here, you can either turn on or disable features and change the theme and keyboard shortcuts.
With DevTools, you can measure the performance of your pages using the Timeline and Profiles tools. These tools can help you find bottlenecks in your code so that you can optimize your pages for better performance.
The Device Mode is a feature in DevTools that allows you to simulate how your pages will look and behave on different types of devices. With Device Mode, you can adjust the size and position of the viewport, emulate different types of devices, and even simulate different types of networks to test how your pages will perform under different conditions.
The Browser Mode is a feature in DevTools that allows you to simulate how your pages will look and behave in different types of browsers. With Browser Mode, you can select from a list of common browsers and view your pages as if that browser was rendering them. This can be useful for testing how your pages will look and behave on different platforms.
Network Throttling is a feature in DevTools that allows you to simulate how your pages will load and perform under different network conditions. With Network Throttling, you can select from a list of common network types and view your pages as if they were being loaded over that type of connection. This can be useful for testing how your pages will perform on different types of devices and under different conditions.
The Console is one of the most powerful features in DevTools, and it can be very useful for development and debugging purposes. If you're unfamiliar with the Console, it's a way to view and interact with the JavaScript code on your pages. You can log messages, run commands, and even debug your code using the Console.
If you are looking at any kind of trouble with the layout of your page, or if you're trying to figure it out why something isn't working right, the Inspect tool can be very helpful. With Inspect, you can view the HTML and CSS code for any element on your page and make changes to that code if necessary.
The Network panel is a great tool for optimizing the performance of your pages. With the Network panel, you can view information about each request made when loading your page, including the type of request, the URL, the response time, and more. This information can be very helpful while troubleshooting performance issues.
If you're working on a responsive design, the Device Mode can be very helpful. With Device Mode, you can select from a list of common devices and view your pages as if they were being rendered on that device. This can be useful for testing how your pages will look and behave on different screen sizes and devices.
The Network Condition Simulator is a tool that allows you to simulate different network conditions. With the Network Condition Simulator, you can select from a list of common network types and view your pages as if they were being loaded over that type of connection. This can be useful for testing how your pages will perform on different types of devices and under different conditions.
If you are interested in measuring the real-time performance of your pages, the Performance panel can be very helpful. With the Performance panel, you can view information about the loading time, JavaScript execution time, and more. This information can be very helpful while troubleshooting performance issues.
The Timeline is a tool that allows you to view a detailed log of all the events that occur while loading your page. With the Timeline, you can see how long each event takes and identify any bottlenecks that might be causing performance issues.
The Memory panel can be very helpful if you're having trouble with memory leaks on your pages. With the Memory panel, you can take a snapshot of the memory usage on your page and then inspect that snapshot to find any areas where memory is being improperly used.
The Audits panel is a tool that allows you to generate reports about the performance of your pages automatically. With the Audits panel, you can select from a list of auditing options and then view a report that details any areas where your page could be improved.
The PageSpeed Insights extension is a tool that allows you to measure the performance of your pages using Google's PageSpeed Insights service. With the PageSpeed Insights extension, you can generate reports about the performance of your pages and get recommendations for how to improve that performance.
The Lighthouse extension is a tool that allows you to generate reports about the quality of your web pages. With the Lighthouse extension, you can select from a list of auditing options and then view a report that details areas where your page could be improved.
The WebPageTest extension is a tool that allows you to measure the performance of your pages using Google's WebPageTest service. With the WebPageTest extension, you can generate reports about the performance of your pages and get recommendations for how to improve that performance.
The User Timing API is a tool that allows you to measure the performance of your pages by providing marks and measures. With the User Timing API, you can set marks at specific points in your code and then measure the time between those marks. This information can be really helpful in troubleshooting performance issues. 152ee80cbc
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