Interactive Web Pages :Programming Foundations with JavaScript, HTML and CSS (Java Programming and Software Engineering Fundamentals Specialization) Answers 2025

1. Question 1

Correct answer:
✔️ The code can check if the image is null before processing it.
❌ The code clears the canvas before performing the green screen algorithm.
❌ Global variables must be initialized when they are declared.

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2. Question 2

Correct answers:
✔️ fgImage == null
✔️ ! fgImage.complete()
❌ fgImage.complete()
❌ fgImage != null

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3. Question 3

Correct answer:
✔️ The first code block
Because the global x remains null and is checked after calling the function.

❌ The second block (checks inside function, but local variable shadows global).
❌ The third block (function changes global x to 2).

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4. Question 4

Correct answer:
✔️ multiple=”false” (removes multi-file selection; default is single file)
❌ accept=”image/*” (only restricts file type)
❌ id=”finput” (only gives an ID)

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5. Question 5

Correct answer:
✔️ A script specifying where to find the JavaScript library for SimpleImage
(SimpleImage must be imported or code won’t run.)

❌ var img = file.value (not required; SimpleImage needs the input element, not the value)
❌ var context = canvas.getContext(“2d”) (SimpleImage handles drawing internally)

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6. Question 6

Correct answer:
✔️ Second pixel
Because rgb(153,51,255) has a much higher brightness average than rgb(0,153,153).

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7. Question 7

Correct answer:
✔️ You would like to be able to reference the input element programmatically.
❌ An ID is required in order to use an event handler.
❌ The id attribute is required for input elements.

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📌 Summary Table

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