Debugging Techniques in Browsers Quiz

1. What is the primary tool for inspecting elements in a webpage?

• The JavaScript Debugger.
• The Source Map Viewer.
• The Developer Console.
• The Inspect Element tool.

2. How do you access the Inspect Element tool?

• Press Ctrl + Shift + I to open the developer tools directly.
• Right-click on any element on the webpage and select `Inspect` or `Inspect Element` from the context menu.
• Use the browser`s menu to find the Inspect Element option.
• Click on the address bar and type `inspect.`

3. What does the Inspect Element tool allow you to do?

• It allows you to play videos directly in the browser.
• It allows you to view and edit HTML and CSS on the fly.
• It enables you to install new plugins easily.
• It helps you download files from the web quickly.

4. How do you change the color of a button dynamically using the Inspect Element tool?

• Click on the button, go to `Edit,` and select a color from a palette.
• Alt-click the button, choose `Modify,` and set the color to red in the dialog.
• Double-click the button and change its background color to red in the popup.
• Right-click the button, select `Inspect,` and in the Styles pane, change `color: blue;` to `color: red;`.

5. What is the purpose of the Console in browser debugging?

• The Console is used for editing HTML directly.
• The Console is used to display images in the browser.
• The Console is used for styling web pages with CSS.
• The Console is used for logging information, errors, and warnings.

6. How do you open the Console in browser developer tools?

• Press Ctrl + Alt + Del to open it
• Close the browser and restart it
• Click on the browser icon twice to launch it
• Open dev tools and select `Console` tab

7. What are the common methods for logging information in the Console?

• `console.log()`, `console.error()`, and `console.warn()`.
• `log.console()`, `error.console()`, and `warn.console()`.
• `print.log()`, `print.error()`, and `print.warn()`.
• `console.write()`, `console.alert()`, and `console.message()`.

8. How do you set a breakpoint in your code?

• Open the developer tools, navigate to the `Sources` tab, and click on the line number where you want to set the breakpoint.
• Simply type `debugger` in the JavaScript file, then refresh the page.
• Execute the function with a special command to trigger the breakpoint feature.
• Write `breakpoint` in the code wherever needed to pause execution.

9. What is the purpose of the Network panel in browser debugging?

• It allows users to edit HTML and CSS directly on the page.
• It provides real-time logging for JavaScript errors and warnings.
• It enables users to profile the performance of web applications.
• It helps monitor network requests and responses, including status codes, headers, and payloads.

10. How do you access the Network panel?

• Open the developer tools and navigate to the `Network` tab.
• Click on the `View` menu and select `Network.`
• Use the shortcut Ctrl+N to open the Network panel.
• Type `Network` in the address bar and hit Enter.

11. What are source maps used for in debugging?

• They store your code in a database for easier retrieval later.
• They compress your code to improve loading speed for users.
• They link your minified code back to your original source code, making debugging easier.
• They automatically fix errors in your code to prevent crashes.

12. How do you ensure source maps are generated?

• Only run your JavaScript without any tools.
• Write source maps manually in your code.
• Use a build tool like Webpack that generates source maps.
• Comment out the lines you want to debug.

13. What is the JavaScript Profiler used for?

• It is used to edit CSS styles in real-time for webpages.
• It helps analyze the performance of your JavaScript code by collecting runtime performance data.
• It monitors HTTP requests made by the webpage.
• It allows you to run JavaScript code in a sandbox environment.

14. How do you start profiling your JavaScript code?

• Write additional comments in your code to make it clearer.
• Use the command line to run your script and measure execution time.
• Restart the browser and clear the cache to optimize your code.
• Open the developer tools, navigate to the `Profiler` tab, and click `Start` to begin profiling.

15. How do you debug asynchronous code?

• Rely on console messages alone to debug without checking stack traces.
• Write synchronous code to avoid issues with asynchronous debugging.
• Use the console to display all function variables without pausing execution.
• Set breakpoints in asynchronous code using the `async` checkbox in the `Sources` tab and use the `Call Stack` pane to trace asynchronous calls.

16. What is the Call Stack used for in debugging asynchronous code?

• It stores all the variables in the code.
• It lists all the CSS styles applied to elements.
• It manages the event listeners on a webpage.
• It helps trace asynchronous calls by showing the call stack.

17. How do you set a breakpoint in an asynchronous function?

• Right-click the function name and select `Set Breakpoint`.
• Click on the element in the webpage and press the `Pause` button.
• Open the Console and type `breakpoint();` to stop the function.
• Open the developer tools, navigate to the `Sources` tab, set a breakpoint inside the asynchronous function, and use the `async` checkbox if necessary.

18. What is the purpose of the Elements tab in browser debugging?

• It helps identify issues by allowing you to inspect and edit HTML and CSS elements directly.
• It generates summary reports of website traffic and user behavior.
• It compiles images for better performance on webpages.
• It processes JavaScript files for faster load times.

19. How do you access the Elements tab?

• Use the command line to enter `show Elements`.
• Click on the browser menu and select `Elements`.
• Open the developer tools and navigate to the `Elements` tab.
• Press Ctrl + E to access the Elements panel.

20. What is the Console log used for in debugging?

• It is used for compressing JavaScript code into a smaller size.
• It is used for logging information, errors, and warnings to help diagnose issues in your code.
• It is used for storing files related to a project setup.
• It is used for changing the visual style of web elements directly.

21. How do you log messages in the Console?

• Use `log.console()`, `log.error()`, and `log.warn()` in your JavaScript code.
• Use `message.log()`, `message.error()`, and `message.warn()` in your JavaScript code.
• Use `print.log()`, `print.error()`, and `print.warn()` in your JavaScript code.
• Use `console.log()`, `console.error()`, and `console.warn()` in your JavaScript code.

22. What is the difference between `console.log()`, `console.error()`, and `console.warn()`?

• `console.log()` writes logs, `console.error()` throws exceptions, and `console.warn()` issues notifications.
• `console.log()` sends alerts, `console.error()` displays errors, and `console.warn()` shows tips.
• `console.log()` prints data, `console.error()` records bugs, and `console.warn()` captures events.
• `console.log()` logs messages, `console.error()` logs errors, and `console.warn()` logs warnings.

23. How do you set up a simple breakpoint in your code?

• Use a text editor to write your code and save it without debugging.
• Open the developer tools, navigate to the `Sources` tab, and click on the line number where you want to set the breakpoint.
• Highlight the code you want to debug and print it to the console.
• Run your code directly without inspecting any part of it.

24. What happens when you set a breakpoint in your code?

• The execution of your code will pause at the specified line, allowing you to inspect variables and the call stack.
• Your code will run without interruption.
• It will automatically fix any errors in your code.
• The code will restart from the beginning.

25. How do you inspect variables when a breakpoint is hit?

• Use Console commands to display variables.
• Change the color of the text in the Elements tab.
• Use the `Scope` pane in the developer tools to inspect variables.
• Click the `Refresh` button to restart the program.

26. What is the Network tab used for in browser debugging?

• It allows you to edit HTML and CSS elements directly.
• It measures the performance of the JavaScript code execution.
• It displays JavaScript errors and warnings in real-time.
• It helps monitor network requests and responses, including status codes, headers, and payloads.

27. How do you monitor network requests and responses?

• Right-click on the page and select `Load Network Requests`.
• Click on the `Performance` tab and analyze load times for network requests.
• Use the console to log all network requests made by the page.
• Open the developer tools, navigate to the `Network` tab, and reload the page to see network activity.

28. What information can you get from the Network tab?

• You can download images and videos from the web page.
• You can see the source code for all JavaScript files on the page.
• You can access all saved passwords and user data from the browser.
• You can get status codes, headers, and payloads from network requests and responses.

29. How do you use source maps to debug your code?

• Ensure your build tool generates source maps (e.g., using Webpack), then open the developer tools and navigate to the `Sources` tab to view the original source code.
• Disable source maps in your build tool settings for a cleaner output.
• Use console.log statements exclusively to identify issues in your minified code.
• Write debugging code inside your JavaScript files and execute them manually.

30. What is the Accessibility pane used for in debugging?

• It allows you to view and edit JavaScript code live.
• It analyzes the load time of web page resources.
• It provides insights and suggestions on the accessibility of web page elements.
• It shows real-time network activity and response times.