Performance Basics — Quiz

Answer all 5 questions, then submit. You need 60% to pass. Log in to save progress.

Question 1

What does a plain <script> tag do to page rendering?

A Nothing — it loads in the background

B It blocks the page from building while it downloads and runs

C It speeds the page up

D It only runs on mobile

Question 2

Which attribute is the safe default for most scripts?

A async

B defer

C blocking

D preload

Question 3

What does setting an image's width and height prevent?

A Slow downloads

B The page jumping around as images load

C Broken images

D Caching

Question 4

What does loading="lazy" do?

A Compresses the image

B Loads off-screen images only when the user scrolls near them

C Disables the image on slow networks

D Doubles the image size

Question 5

Why does lean, fast HTML matter most for your audience?

A It doesn't — everyone has fast internet

B Many users are on budget phones and slow networks where heavy pages fail

C It changes the page's colour

D It improves desktop only