Images and performance
Definition and example
Images and performance is the focus of this lesson. Give width and height so the layout does not jump, and lazy-load below the fold. The task asks you to apply that idea in a small example: Which loading value defers an off-screen image. Before you run the code, predict what should happen. Then Inspect the rendered page and its element structure and compare it with your prediction. If the result differs, change one relevant line and run it again. Testing one change at a time makes the cause of a result easier to understand.
Run your code to see the output and the checks.
Submit your code to see results
Write your code in the middle column and press Run code.
Why this works
Checks on this task:
- The value found in “img” must equal “lazy”.
The task and step-by-step instructions are written as comments at the top of the editor. Change one relevant line, run it, and compare the result with these checks.
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Incorrect attempts before answer: 0 / 3
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0 passed of 56 tasks
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Worked answer
You have made three incorrect attempts. Review this example, close the window, and continue practising.