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1. check_circle

   Question 1 · Right

   Which method returns the first element that matches a CSS selector?

   Your answer:

   querySelector()

   querySelector() takes any CSS selector and returns the first match, or null. querySelectorAll() returns every match.

2. cancel

   Question 2 · Not quite

   Which of these events bubble up to parent elements?

   Your answer:

   click, keydown, focus

   Right answer:

   click, keydown

   click and keydown bubble. focus and mouseenter don't; use focusin and mouseover when a parent needs to hear them.

3. check_circle

   Question 3 · Right

   setTimeout(fn, 0) runs fn before the next line of code.

   Your answer:

   False

   Even with a delay of zero, the callback waits in the queue until the code running now has finished. The next line runs first.

4. check_circle

   Question 4 · Right

   With event delegation, where do you attach the listener?

   Your answer:

   On a parent of the children

   One listener on a parent hears events from all of its children, including children added later, through bubbling.

5. check_circle

   Question 5 · Right

   What does new FormData(form) collect?

   Your answer:

   The named fields and their values

   FormData collects each named, enabled field and its current value, the same set the browser would send.