Mobile Marketing Mobile-Optimized Web Presence 4 — Questions and Answers
Question 1: A mobile website has a Cumulative Layout Shift (CLS) score of 0.28. How is this rated by Google's Core Web Vitals?
- Good (below threshold)
- Needs Improvement
- Poor (Correct answer)
- Critical failure
Correct answer: Poor
Google rates CLS above 0.25 as 'Poor'; a score of 0.28 falls in this range, meaning the page has significant unexpected layout shifts.
Question 2: What technique involves serving different HTML content to mobile and desktop users from the same URL based on the User-Agent string?
- Responsive Web Design
- Dynamic Serving (Correct answer)
- URL Redirection
- Progressive Web Apps
Correct answer: Dynamic Serving
Dynamic serving uses the User-Agent header to detect the device type and serve different HTML/CSS from the same URL, without a redirect.
Question 3: Which of the following is a disadvantage of using separate mobile URLs (e.g., m.example.com) compared to responsive design?
- Separate URLs cannot be indexed by search engines
- They require maintaining two separate codebases and content sets (Correct answer)
- They are not supported by modern smartphones
- They prevent mobile-specific features like GPS
Correct answer: They require maintaining two separate codebases and content sets
Separate mobile sites require duplicating content, development, and maintenance efforts across two codebases, increasing cost and complexity.
Question 4: On mobile landing pages, above-the-fold content refers to content that is visible:
- Within the first 3 seconds of page load
- Without any scrolling on the initial screen view (Correct answer)
- In the first 600 pixels of page height
- Only on screens larger than 375px wide
Correct answer: Without any scrolling on the initial screen view
Above-the-fold content is what users see immediately upon landing without scrolling, making it critical for first impressions and CTA visibility.
Question 5: What does minifying CSS and JavaScript files accomplish for mobile web performance?
- Removes unused browser APIs
- Reduces file size by stripping whitespace, comments, and shortening variable names (Correct answer)
- Encrypts code to prevent theft
- Converts files to a binary format for faster parsing
Correct answer: Reduces file size by stripping whitespace, comments, and shortening variable names
Minification removes unnecessary characters (whitespace, comments) from code without changing functionality, resulting in smaller files that download faster.
Question 6: A Progressive Web App (PWA) differs from a standard mobile website primarily because it can:
- Be built with native iOS or Android code
- Work offline and be installed on the home screen (Correct answer)
- Access the device camera without HTTPS
- Run advertisements without a browser
Correct answer: Work offline and be installed on the home screen
PWAs use service workers and web app manifests to enable offline functionality and home screen installation, blurring the line between web and native apps.
Question 7: When configuring Google Search Console, what signal should you use to verify that Googlebot can crawl your mobile pages correctly?
- URL Inspection Tool using the 'Mobile' rendering option (Correct answer)
- Core Web Vitals report filtered by desktop
- Crawl Stats report filtered by image requests
- Performance report sorted by impressions
Correct answer: URL Inspection Tool using the 'Mobile' rendering option
The URL Inspection Tool in GSC shows how Googlebot renders a page, including mobile rendering via the smartphone Googlebot user agent.
Mobile Marketing Mobile-Optimized Web Presence 4
A mobile website has a Cumulative Layout Shift (CLS) score of 0.28.
How is this rated by Google's Core Web Vitals?