Descendant selector in CSS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to select all p elements inside any div.

CSS

div [1] p { color: blue; }

Drag options to blanks, or click blank then click option'

A>

B(space)

C+

D~

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' selects only direct children, not all descendants.

Using '+' or '~' selects siblings, not descendants.

The space between selectors means descendant. It selects all p elements inside div, no matter how deep.

2fill in blank

medium

Complete the code to select all span elements inside any section.

CSS

section[1]span { font-weight: bold; }

Drag options to blanks, or click blank then click option'

A>

B+

C(space)

D~

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' selects only direct children, missing deeper descendants.

Using '+' or '~' selects siblings, not descendants.

The space means select all span elements inside section, no matter how deep.

3fill in blank

hard

Fix the error in the selector to select all li elements inside any ul.

CSS

ul[1]li { list-style-type: none; }

Drag options to blanks, or click blank then click option'

A(space)

B+

C>

D~

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' selects only direct children, missing nested li.

Using '+' or '~' selects siblings, not descendants.

The space is needed to select all li elements inside ul, not just direct children or siblings.

4fill in blank

hard

Fill both blanks to select all em elements inside any article.

CSS

article[1]em { font-style: italic; } /* [2] selector */

Drag options to blanks, or click blank then click option'

A(space)

B>

CDescendant

DChild

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' instead of space for descendant selector.

Writing 'Child' instead of 'Descendant' in the comment.

The space is the descendant selector, which selects all em inside article. The comment explains this.

5fill in blank

hard

Fill all three blanks to select all strong elements inside any nav and add a comment naming the selector.

CSS

nav[1]strong { color: red; } /* [2] selector used here to select [3] */

Drag options to blanks, or click blank then click option'

A(space)

B>

CDescendant

Dall nested <strong> elements

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' instead of space for descendant selector.

Wrong comment text that does not explain the selector.

The space is the descendant selector symbol. The comment names the selector and explains it selects all nested strong elements inside nav.

Practice

1. What does the CSS descendant selector div p do?

easy

A. Selects only <p> elements that are direct children of <div> elements.

B. Selects all <p> elements and <div> elements separately.

C. Selects all <div> elements that are inside <p> elements.

D. Selects all <p> elements inside any <div> elements, no matter how deep.

Solution

1. Step 1: Understand the descendant selector syntax

   The space between div and p means select p elements inside div elements at any depth.

2. Step 2: Differentiate from child selector

   The child selector uses > and selects only direct children, but here it's a space, so all nested p inside div are selected.

3. Final Answer:

   Selects all <p> elements inside any <div> elements, no matter how deep. -> Option D

4. Quick Check:

   Descendant selector = space = nested elements [OK]

Hint: Space means any nested element inside another [OK]

Common Mistakes:

• Confusing descendant selector with child selector
• Thinking it selects only direct children
• Mixing up order of selectors

2. Which of the following is the correct syntax for selecting all <span> elements inside <section> elements using a descendant selector?

easy

A. section span

B. section > span

C. section+span

D. section, span

Solution

1. Step 1: Recall descendant selector syntax

   The descendant selector uses a space between selectors to select nested elements.

2. Step 2: Analyze each option

   section > span uses child selector (>), section+span uses adjacent sibling (+), section, span selects both separately with a comma. Only section span uses a space correctly.

3. Final Answer:

   section span -> Option A

4. Quick Check:

   Space = descendant selector syntax [OK]

Hint: Use space between selectors for descendants [OK]

Common Mistakes:

• Using > instead of space for descendants
• Using + which selects siblings, not descendants
• Using comma which selects separate elements

3. Given the HTML:

<div>
  <article>
    <p>Hello</p>
  </article>
  <p>World</p>
</div>

And CSS:

div p { color: red; }

Which <p> elements will be red?

medium

A. Both <p> elements inside <div>

B. Only the <p> directly inside <div>

C. Only the <p> inside <article>

D. No <p> elements will be red

Solution

1. Step 1: Identify the selector target

   The selector div p selects all p elements inside any div, at any depth.

2. Step 2: Check HTML structure

   Both p elements are inside the div: one inside article (nested), one directly inside div.

3. Final Answer:

   Both <p> elements inside <div> will be red -> Option A

4. Quick Check:

   Descendant selector selects all nested matches [OK]

Hint: Descendant selector selects all nested matches [OK]

Common Mistakes:

• Thinking only direct children are selected
• Ignoring nested elements inside other tags
• Assuming only first matching element is styled

4. Consider this CSS rule:

ul li a { text-decoration: none; }

But the links inside list items are still underlined. What is the most likely problem?

medium

A. The selector is incorrect; it should be ul > li > a.

B. The a elements are not inside li elements.

C. There is a more specific CSS rule overriding this one.

D. CSS does not support descendant selectors.

Solution

1. Step 1: Understand the selector

   The selector ul li a correctly targets a inside li inside ul.

2. Step 2: Consider CSS specificity and overrides

   If links remain underlined, likely another CSS rule with higher specificity or inline style overrides this rule.

3. Final Answer:

   There is a more specific CSS rule overriding this one. -> Option C

4. Quick Check:

   Overrides cause expected styles to fail [OK]

Hint: Check for more specific CSS rules overriding yours [OK]

Common Mistakes:

• Assuming descendant selector syntax is wrong
• Not checking for CSS specificity conflicts
• Ignoring inline styles or browser defaults

5. You want to style all <em> elements inside <article> elements, but only if they are inside a <section> inside that <article>. Which CSS selector correctly targets this?

hard

A. article em section

B. article section em

C. article > section > em

D. section article em

Solution

1. Step 1: Understand the nesting order

   The em is inside section, which is inside article. So the order is article then section then em.

2. Step 2: Analyze each selector

   article section em uses article section em which matches em inside section inside article. section article em reverses order incorrectly. article > section > em uses child selectors which may be too strict. article em section is invalid order.

3. Final Answer:

   article section em -> Option B

4. Quick Check:

   Descendant selector order matches nesting order [OK]

Hint: Write selectors in ancestor to descendant order [OK]

Common Mistakes:

• Reversing selector order
• Using child selectors when descendants are nested deeper
• Confusing selector order with HTML structure