Content area in CSS - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ layout

intermediate

Understanding the CSS Content Area Box Model

Given the CSS below, what is the total width of the <div> element's content area (excluding padding, border, and margin)?

CSS

div {
  width: 300px;
  padding: 20px;
  border: 5px solid black;
  margin: 10px;
  box-sizing: content-box;
}

A 350px

B 300px

C 370px

D 360px

💡 Hint

Remember that with box-sizing: content-box, the width property sets the content area width only.

The width property with box-sizing: content-box defines the content area width. Padding, border, and margin add outside this width.

So, the content area width is exactly 300px.

❓ selector

intermediate

Selecting the Content Area with CSS

Which CSS selector targets only the content area inside a <section> element, excluding padding and border?

A section { background-clip: content-box; }

B section { box-sizing: border-box; }

C section { padding: 0; }

D section { margin: 0; }

💡 Hint

The background-clip property controls where the background is painted relative to the box model.

The background-clip: content-box; makes the background color or image apply only to the content area, excluding padding and border.

Other options affect box sizing or spacing but do not restrict background to content area.

❓ rendering

advanced

Visual Effect of Changing Box-Sizing on Content Area

What will be the visible width of the <article> element's content area when the CSS below is applied?

CSS

article {
  width: 400px;
  padding: 30px;
  border: 10px solid blue;
  box-sizing: border-box;
}

A 320px

B 350px

C 400px

D 380px

💡 Hint

With box-sizing: border-box, the width includes padding and border.

With box-sizing: border-box, the width property sets the total width including padding and border.

Content width = 400px - (30px*2) - (10px*2) = 400 - 60 - 20 = 320px.

❓ accessibility

advanced

Ensuring Content Area Accessibility with CSS

Which CSS practice best improves accessibility by ensuring the content area is readable on all devices?

A Apply <code>opacity: 0.5;</code> to content area for style.

B Set fixed pixel widths for content area to maintain layout.

C Use <code>display: none;</code> on content area when screen is small.

D Use relative units like <code>em</code> or <code>rem</code> for padding and font size.

💡 Hint

Think about how text size and spacing adapt on different screen sizes and user settings.

Using relative units like em or rem allows content area padding and font size to scale with user preferences and device settings, improving readability.

Fixed pixel widths can cause layout issues on small screens. Hiding content or reducing opacity harms accessibility.

🧠 Conceptual

expert

Effect of CSS Logical Properties on Content Area

If you replace padding-left and padding-right with padding-inline-start and padding-inline-end in CSS, what is the main benefit for the content area?

A Content area padding is removed completely.

B Content area width becomes fixed regardless of screen size.

C Content area adapts automatically to text direction (LTR or RTL) without changing CSS.

D Content area ignores margin settings.

💡 Hint

Consider how languages with different reading directions affect layout.

CSS logical properties like padding-inline-start and padding-inline-end adapt to the writing direction of the document (left-to-right or right-to-left).

This means the content area padding automatically adjusts without needing separate CSS for different languages.