Min and max functions in CSS - Practice Problems & Coding Challenges

Challenge - 5 Problems

📝 Syntax

intermediate

What is the computed width of the box?

Consider this CSS code for a box. What will be the final width of the box in pixels when rendered in a browser?

CSS

div {
  width: min(50vw, 300px);
}

A The width will always be 300px regardless of viewport size.

B The width will be 50% of the viewport width or 300px, whichever is smaller.

C The width will be 50% of the viewport width regardless of 300px.

D The width will be the larger of 50vw and 300px.

💡 Hint

Remember, min() picks the smallest value from the list.

The min() function chooses the smallest value between 50vw (50% of viewport width) and 300px. So the box width will never exceed 300px and will shrink if 50vw is smaller.

❓ rendering

intermediate

Which CSS rule sets the height to the larger value?

You want a box to have a height that is at least 200px but grows with 30% of the viewport height. Which CSS rule achieves this?

A height: max(200px, 30vh);

B height: min(200px, 30vh);

C height: 200px + 30vh;

D height: calc(max(200px, 30vh));

💡 Hint

Use the function that picks the bigger value.

The max() function picks the larger value between 200px and 30vh, ensuring the height is never less than 200px but grows with viewport height.

❓ selector

advanced

Which CSS snippet correctly limits font size responsively?

You want the font size to be at least 1rem, but no more than 2rem, and scale with 5vw in between. Which CSS rule achieves this?

A font-size: min(1rem, max(5vw, 2rem));

B font-size: max(min(1rem, 5vw), 2rem);

C font-size: min(max(1rem, 5vw), 2rem);

D font-size: max(1rem, min(5vw, 2rem));

💡 Hint

Think about nesting max and min to clamp a value between two limits.

The correct pattern to clamp a value between a minimum and maximum is max(minimum, min(value, maximum)). Here, it ensures font size is at least 1rem, at most 2rem, scaling with 5vw.

❓ layout

advanced

What is the width of the container on a 600px wide screen?

Given this CSS, what is the container width in pixels when the viewport width is 600px?

CSS

.container {
  width: max(300px, min(50vw, 400px));
}

A 300px

B 300px if 50vw is less than 300px, else 50vw

C 400px

D 300px if 50vw is less than 300px, else 400px

💡 Hint

Calculate 50vw first, then apply min and max functions step by step.

50vw of 600px is 300px. Then min(50vw, 400px) is min(300px, 400px) = 300px. Then max(300px, 300px) is 300px. So the width is 300px.

❓ accessibility

expert

How do min() and max() help improve accessibility in responsive design?

Which statement best explains how using CSS min() and max() functions can improve accessibility for users on different devices?

A They disable zoom on mobile devices to keep layout fixed.

B They automatically add ARIA labels to elements based on size.

C They allow content to resize within limits, preventing text from becoming too small or too large, improving readability.

D They force all elements to have the same size regardless of screen.

💡 Hint

Think about how size limits affect user experience and readability.

Using min() and max() lets designers set size boundaries so text and elements stay readable and usable on all screen sizes, which helps accessibility.