Improve your website with Web Vitals quiz

1. Match these metrics with their purpose.

   Each answer only matches one item.

   Largest Contentful Paint (LCP)

     Measures load performance Measures interactivity Measures visual stability

   First Input Delay (FID)

     Measures load performance Measures interactivity Measures visual stability

   Cumulative Layout Shift (CLS)

     Measures load performance Measures interactivity Measures visual stability

2. Field data that captures the performance experienced by a website's actual users is also known as ___.

   PageSpeed Insights (PSI)

   Real-user monitoring (RUM)

   Cumulative Layout Shift (CLS)

   Total Blocking Time (TBT)

3. Which of the following are recommended to prevent your performance-measurement code from negatively impacting the performance of your web page? Select all that apply.

   Choose as many answers as you see fit.

   Defer your analytics.

   Collect analytics immediately.

   Don’t create long tasks.

   Automatically abort tasks that take too long.

   Don't track more than what you need.

   Use non-blocking APIs.

4. A Long Task is JavaScript code that monopolizes the main thread for extended periods of time. During this time, users may find your UI unresponsive. Any piece of code that blocks the main thread for ___ms or more can be characterized as a Long Task.

   20

   50

   70

   100

5. True or false? Always insert new content before existing content. This ensures that any layout shifts that occur are expected.

   True.

   False

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