Role of CSS in web development - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

What is the primary role of CSS in web development?

Choose the option that best describes what CSS does for a webpage.

A CSS is responsible for server-side processing of web requests.

B CSS is used to add interactivity and handle user events on a webpage.

C CSS controls the layout and appearance of HTML elements on a webpage.

D CSS stores and manages data for web applications.

💡 Hint

Think about how colors, fonts, and spacing are controlled on a webpage.

CSS stands for Cascading Style Sheets and is used to style HTML elements. It controls colors, fonts, layouts, and spacing, making webpages look nice and organized.

📝 Syntax

intermediate

Which CSS rule correctly changes the text color of all paragraphs to blue?

Select the CSS code snippet that will make all

elements have blue text.

A p { color = blue; }

B p { text-color: blue; }

C p { font-color: blue; }

D p { color: blue; }

💡 Hint

The CSS property for text color is just 'color'.

The correct CSS property to change text color is color. The syntax uses a colon : to assign values, not equals =.

❓ rendering

advanced

What will be the visual effect of this CSS on a webpage?

Given the CSS below, what will you see on the webpage?

CSS

div {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 200px;
  border: 2px solid black;
}

A A 200px tall box with content aligned to the top left corner.

B A 200px tall box with content centered horizontally and vertically inside it.

C A box with content stretched to fill the entire width but aligned at the bottom.

D A box with content hidden because of display: flex.

💡 Hint

Flexbox centers content when justify-content and align-items are set to center.

The display: flex creates a flexible container. justify-content: center centers content horizontally, and align-items: center centers content vertically. The height and border define the box size and outline.

❓ selector

advanced

Which CSS selector targets only

elements that are direct children of

?

Choose the selector that applies styles only to

elements directly inside a

, not nested deeper.

A ul > li

B ul li

C li > ul

D ul + li

💡 Hint

The '>' symbol means direct child in CSS selectors.

ul > li selects only li elements that are immediate children of ul. ul li selects all li descendants, including nested ones.

❓ accessibility

expert

Which CSS practice improves accessibility for users with visual impairments?

Select the CSS approach that best supports accessibility by improving readability and user experience.

A Using relative font sizes like rem or em instead of fixed pixels.

B Setting all text color to light gray on white background for subtlety.

C Using only color to convey important information without text labels.

D Disabling user zoom by setting maximum-scale=1 in viewport meta tag.

💡 Hint

Think about how users might adjust text size for easier reading.

Relative font sizes like rem or em allow text to scale based on user settings, improving readability. Using poor contrast or disabling zoom harms accessibility.