# JavaScript Audio and Video Quiz

**URL:** <https://forum.freecodecamp.org/t/javascript-audio-and-video-quiz/788837>\
**Category:** Curriculum Help\
**Tags:** javascript\
**Created:** [May 14, 2026, 3:39pm UTC](https://forum.freecodecamp.org/t/javascript-audio-and-video-quiz/788837 "2026-05-14T15:39:31Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![suphxx](https://sea3.discourse-cdn.com/freecodecamp/user_avatar/forum.freecodecamp.org/suphxx/32/413156_2.png) [@suphxx](https://forum.freecodecamp.org/u/suphxx)\
**Post date:** [May 14, 2026, 3:39pm UTC](https://forum.freecodecamp.org/t/javascript-audio-and-video-quiz/788837/1 "2026-05-14T15:39:31Z")

</div>

I was taking the quiz and noticed that one of the questions requires the wrong answer to be selected to be considered right. The question:

17. What is the purpose of the Media Source Extensions API?

It lets you directly pass a user’s webcam feed to a video element

Enable JavaScript to synchronize multiple audio tracks.

Convert between different media formats.

Add visual effects to video.

I selected “Enable JavaScript to synchronize multiple audio tracks.” And it was marked wrong. The test says the correct answer is “It lets you directly pass a user’s webcam feed to a video element”, however that is the primary function of the Media Capture and Streams API , not MSE right? Or am I mistaken?

---

<div class="post-metadata">

**Author:** ![a1legalfreelance](https://sea3.discourse-cdn.com/freecodecamp/user_avatar/forum.freecodecamp.org/a1legalfreelance/32/385700_2.png) [@a1legalfreelance](https://forum.freecodecamp.org/u/a1legalfreelance)\
**Post date:** [May 14, 2026, 6:06pm UTC](https://forum.freecodecamp.org/t/javascript-audio-and-video-quiz/788837/2 "2026-05-14T18:06:07Z")

</div>

Can you link to the url of the quiz please.

---

<div class="post-metadata">

**Author:** ![suphxx](https://sea3.discourse-cdn.com/freecodecamp/user_avatar/forum.freecodecamp.org/suphxx/32/413156_2.png) [@suphxx](https://forum.freecodecamp.org/u/suphxx)\
**Post date:** [May 14, 2026, 7:51pm UTC](https://forum.freecodecamp.org/t/javascript-audio-and-video-quiz/788837/3 "2026-05-14T19:51:07Z")

</div>

This is the quiz I’m talking about:

> **[freeCodeCamp.org](https://www.freecodecamp.org/learn/javascript-v9/quiz-javascript-audio-and-video/quiz-javascript-audio-and-video)**
>
> Learn to Code — For Free

---

<div class="post-metadata">

**Author:** ![Teller](https://sea3.discourse-cdn.com/freecodecamp/user_avatar/forum.freecodecamp.org/teller/32/412338_2.png) [@Teller](https://forum.freecodecamp.org/u/Teller)\
**Post date:** [May 14, 2026, 9:29pm UTC](https://forum.freecodecamp.org/t/javascript-audio-and-video-quiz/788837/4 "2026-05-14T21:29:28Z")

</div>

Hi @suphxx

Please review the What Are Some Other Examples of Video and Audio APIs? lecture.

Happy coding

---

<div class="post-metadata">

**Author:** ![system](https://global.discourse-cdn.com/freecodecamp/original/3X/e/1/e1c433102e34b46dfaa3e15d13ab9a514b127078.svg) [@system](https://forum.freecodecamp.org/u/system)\
**Post date:** [June 11, 2026, 9:29pm UTC](https://forum.freecodecamp.org/t/javascript-audio-and-video-quiz/788837/5 "2026-06-11T21:29:47Z")

</div>

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.