Media formats overview in HTML - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Which media format is best for high-quality photos with transparency?

You want to display a photo on a website that has transparent areas and needs to look sharp. Which image format should you choose?

A PNG

B JPEG

C GIF

D BMP

💡 Hint

Think about which format supports transparency and good quality.

PNG supports transparency and lossless compression, making it ideal for sharp images with transparent parts.

JPEG does not support transparency and uses lossy compression.

GIF supports transparency but is limited to 256 colors, so not ideal for photos.

BMP is uncompressed and large in size.

📝 Syntax

intermediate

What is the correct HTML tag to embed an audio file?

You want to add an audio file to your webpage that users can play. Which HTML snippet is correct?

HTML

<audio src="song.mp3" controls></audio>

A <sound src="song.mp3" controls></sound>

B <audio src="song.mp3" controls></audio>

C <audio href="song.mp3" controls></audio>

D <media src="song.mp3" controls></media>

💡 Hint

Check the correct tag name and attribute for audio files.

The <audio> tag is used to embed audio files. The src attribute specifies the file, and controls adds play/pause buttons.

Other tags like <sound> or <media> do not exist in HTML5.

href is not valid for <audio>.

❓ rendering

advanced

What will the browser display with this video tag?

Consider this HTML code:

<video width="320" height="240" controls>
  <source src="movie.webm" type="video/webm">
  <source src="movie.mp4" type="video/mp4">
  Your browser does not support the video tag.
</video>

What will the user see if their browser supports MP4 but not WebM?

A The video from movie.mp4 will play.

B The text 'Your browser does not support the video tag.' will show.

C The video from movie.webm will play.

D No video or text will appear.

💡 Hint

Browsers try sources in order and pick the first supported format.

The browser tries the <source> elements in order. If it does not support the first format (WebM), it moves to the next (MP4).

Since the browser supports MP4, it will play that video.

The fallback text only shows if no sources are supported.

❓ selector

advanced

Which CSS selector targets all video elements with a 'controls' attribute?

You want to style all <video> tags that have the controls attribute. Which CSS selector is correct?

A video > controls

B video.controls

C video[controls]

D video#controls

💡 Hint

Attribute selectors use square brackets.

video[controls] selects all <video> elements with a controls attribute.

video.controls selects videos with class 'controls'.

video#controls selects video with id 'controls'.

video > controls looks for child elements named 'controls', which is invalid.

❓ accessibility

expert

How to make an image accessible for screen readers?

You have an image that shows a company logo. Which HTML snippet best helps screen readers understand the image?

A <img src="logo.png">

B <img src="logo.png" title="Company logo">

C <img src="logo.png" aria-hidden="true">

D <img src="logo.png" alt="Company logo">

💡 Hint

Screen readers rely on a specific attribute to describe images.

The alt attribute provides descriptive text for screen readers.

Option D has no description, so screen readers skip it or read the file name.

Option D hides the image from screen readers.

Option D shows a tooltip but does not help screen readers.