Select all that apply. Which of the following are Core Web Vitals?
- Total Blocking Time
- First Input Delay
- First Contentful Paint
- Cumulative Layout Shift
Explanation: Among the options provided, First Input Delay (FID) and Cumulative Layout Shift (CLS) are indeed Core Web Vitals. Core Web Vitals are specific metrics identified by Google as critical indicators of user experience on the web. FID measures the responsiveness of a webpage by quantifying the delay between a user’s first interaction with the page and the browser’s response to that interaction. It reflects how quickly the page becomes interactive and responsive to user input, which is essential for providing a smooth and engaging user experience. CLS, on the other hand, measures the visual stability of a webpage by calculating the cumulative impact of unexpected layout shifts that occur during the page’s lifespan. It assesses how often and how significantly elements on the page move relative to each other, which can disrupt user engagement and cause frustration. Both FID and CLS are integral components of Core Web Vitals, along with other metrics like Largest Contentful Paint (not listed in the options), that collectively provide insights into various aspects of web performance and user experience. Therefore, selecting First Input Delay and Cumulative Layout Shift accurately identifies them as Core Web Vitals and acknowledges their importance in assessing and improving website performance and user experience, as emphasized by Google.