CSS Worksheet: Selectors Class and Id

HTML and CSS lesson 13: Selectors: element, class and id · Set 502 · 40 questions

Code tip (Dot for class, hash for id): p matches every <p>; .note matches class="note"; #top matches id="top". A dot means class, a hash means id — mixing them up matches nothing. Many elements can share a class; an id belongs to only one element.

1. 1.🎯 How many elements on a page should have the same id? (a) 2 (b) 5 (c) any number (d) 1
2. 2.🎯 Which sign starts an id selector? (a) # (b) @ (c) & (d) .
3. 3.🎯 What kind of selector is #hero? (a) an element selector (b) a class selector (c) an id selector
4. 4.🎯 Which CSS selector matches this element?
   <h2 class="menu" id="hero">Hello</h2> (a) .note (b) #top (c) h2 (d) li
5. 5.🎯 Can many elements share the same class? (a) Yes (b) No
6. 6.🎯 What kind of selector is img? (a) an element selector (b) a class selector (c) an id selector
7. 7.🎯 Which element does the selector h2 style? (a) <h2 class="box"> (b) <div class="box"> (c) <span id="intro"> (d) <li>
8. 8.🎯 Which sign starts a class selector? (a) # (b) & (c) @ (d) .
9. 9.🎯 Which CSS selector matches this element?
   <span class="star" id="logo">Hello</span> (a) .star (b) .menu (c) #star (d) .logo
10. 10.🎯 Which CSS selector matches this element?
    <span class="star" id="intro">Hello</span> (a) p (b) .intro (c) #main (d) #intro
11. 11.🎯 What kind of selector is .star? (a) an element selector (b) an id selector (c) a class selector
12. 12.🎯 Which element does the selector div style? (a) <span> (b) <p class="note"> (c) <div class="note"> (d) <h1 id="logo">
13. 13.True or false: #top is a class selector. (a) True (b) False
14. 14.🎯 Which element does the selector li style? (a) <span class="menu"> (b) <p id="intro"> (c) <div> (d) <li class="menu">
15. 15.🎯 Which element does the selector .note style? (a) <p id="note"> (b) <h1 class="red"> (c) <p class="note"> (d) <p class="big">
16. 16.🎯 Which CSS selector matches this element?
    <span class="box" id="intro">Hello</span> (a) #intro (b) p (c) .intro (d) .star
17. 17.🎯 What kind of selector is #main? (a) a class selector (b) an id selector (c) an element selector
18. 18.True or false: .menu is a class selector. (a) True (b) False
19. 19.🎯 Which element does the selector #top style? (a) <h1 id="top"> (b) <h2 class="note"> (c) <h1 class="top"> (d) <h1 id="intro">
20. 20.🎯 What kind of selector is #logo? (a) a class selector (b) an id selector (c) an element selector
21. 21.🎯 Which element does the selector #top style? (a) <li class="box"> (b) <h2 id="top"> (c) <h2 class="top"> (d) <h2 id="intro">
22. 22.🎯 Which element does the selector .box style? (a) <li id="box"> (b) <li class="star"> (c) <div class="menu"> (d) <li class="box">
23. 23.True or false: #logo is an id selector. (a) True (b) False
24. 24.🎯 Which CSS selector matches this element?
    <h1 class="box" id="intro">Hello</h1> (a) #intro (b) .star (c) #box (d) .intro
25. 25.🎯 Which CSS selector matches this element?
    <h2 class="big" id="hero">Hello</h2> (a) li (b) #top (c) .hero (d) .big
26. 26.🎯 Which CSS selector matches this element?
    <li class="note" id="top">Hello</li> (a) #note (b) div (c) .note (d) .top
27. 27.True or false: img is an id selector. (a) True (b) False
28. 28.🎯 Which CSS selector matches this element?
    <div class="star" id="intro">Hello</div> (a) .menu (b) .intro (c) .star (d) span
29. 29.True or false: #top is an id selector. (a) True (b) False
30. 30.🎯 Which CSS selector matches this element?
    <li class="note" id="intro">Hello</li> (a) div (b) #note (c) .intro (d) #intro
31. 31.🎯 Which element does the selector li style? (a) <span class="big"> (b) <li class="big"> (c) <p id="top"> (d) <div>
32. 32.🎯 Which CSS selector matches this element?
    <p class="menu" id="hero">Hello</p> (a) h1 (b) #top (c) p (d) #menu
33. 33.🎯 Which CSS selector matches this element?
    <p class="big" id="intro">Hello</p> (a) #main (b) #big (c) p (d) .intro
34. 34.True or false: h1 is an id selector. (a) False (b) True
35. 35.🎯 Which element does the selector .note style? (a) <h2 id="note"> (b) <h2 class="big"> (c) <li class="red"> (d) <h2 class="note">
36. 36.🎯 What kind of selector is #top? (a) an element selector (b) a class selector (c) an id selector
37. 37.🎯 Which element does the selector #main style? (a) <span class="main"> (b) <p class="star"> (c) <span id="logo"> (d) <span id="main">
38. 38.🎯 Which CSS selector matches this element?
    <h1 class="red" id="top">Hello</h1> (a) .box (b) h2 (c) h1 (d) #intro
39. 39.🎯 What kind of selector is .big? (a) an element selector (b) a class selector (c) an id selector
40. 40.True or false: body is a class selector. (a) True (b) False

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