Aspect ratio in CSS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the CSS aspect-ratio property do?

It controls the width-to-height ratio of an element, keeping its shape consistent regardless of size changes.

beginner

How do you write an aspect ratio of 16:9 in CSS?

Use aspect-ratio: 16 / 9; to keep the element's width and height in a 16 to 9 ratio.

intermediate

Why is using aspect-ratio better than fixed width and height for responsive design?

Because it lets the element resize while keeping the shape, adapting smoothly to different screen sizes.

intermediate

What happens if you set aspect-ratio but only specify width in CSS?

The height adjusts automatically to keep the aspect ratio based on the width you set.

beginner

Can aspect-ratio be used on images and videos?

Yes, it helps keep their proportions correct even if their container changes size.

What does aspect-ratio: 1 / 1; do to an element?

A Makes the element twice as tall as wide

B Makes the element twice as wide as tall

C Makes the element a square

D Has no effect

An aspect ratio of 1 / 1 means width and height are equal, so the element becomes a square.

If you set width: 200px; and aspect-ratio: 4 / 3;, what is the height?

A 150px

B 300px

C 200px

D 100px

Height = width ÷ (aspect ratio) = 200px ÷ (4/3) = 150px.

Which CSS property helps keep an element's shape consistent on different screen sizes?

A background-color

B font-size

C margin

D aspect-ratio

aspect-ratio controls the shape ratio, keeping it consistent when resizing.

Can aspect-ratio be used without specifying width or height?

A Yes, but it needs at least one dimension to work

B No, it always works alone

C Yes, it sets default size

D No, it only works on images

aspect-ratio needs either width or height to calculate the other dimension.

What is the default aspect ratio if none is set?

A 1 / 1

B No fixed ratio; size depends on content or other styles

C 16 / 9

D 4 / 3

Without aspect-ratio, the element's size depends on content or other CSS rules.

Explain how the CSS aspect-ratio property helps in responsive web design.

Think about how images or boxes keep their shape when screen size changes.

Describe how to use aspect-ratio with a fixed width to maintain a 16:9 ratio.

Remember the ratio is width divided by height.