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App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 444 · 40 questions
TalentJR

Developer's tip (Big and bold): Our rule: every button is at least 48 px tall. Missing px = 48 − height. Leave space between buttons; use clear words like Save or Send. Strong contrast (black on yellow, white on dark green) is easy to read; similar colours are hard.

NameDateTime takenScore ___ / 40
  1. 1.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 44 px tall
    Save button: 32 px tall
    Help button: 40 px tall
    Next button: 36 px tall
  2. 2.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 36 px tall
    Back button: 64 px tall
    Help button: 52 px tall
    Start button: 36 px tall
  3. 3.🌗 Is white on black easy or hard to read on a button? (a) hard to read (b) easy to read
  4. 4.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
  5. 5.True or false: grey text on grey is good button design. (a) True (b) False
  6. 6.🌗 Is black on pale grey easy or hard to read on a button? (a) easy to read (b) hard to read
  7. 7.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 32 px tall
    Next button: 36 px tall
    Start button: 32 px tall
  8. 8.Which colour pair is hard to read? (a) white on black (b) black on yellow (c) black on pale grey (d) light grey on white
  9. 9.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 52 px tall
    Cancel button: 32 px tall
    Save button: 32 px tall
  10. 10.True or false: a big, easy tap area is poor button design. (a) True (b) False
  11. 11.True or false: buttons almost touching is good button design. (a) True (b) False
  12. 12.🔘 Our rule: buttons are at least 48 px tall. The Start button is 36 px tall. How many px taller must it be?
  13. 13.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 60 px tall
    Next button: 24 px tall
    Send button: 72 px tall     (a) Send (b) Back (c) Next
  14. 14.Which colour pair is hard to read? (a) black on pale grey (b) white on dark green (c) red on green (d) white on black
  15. 15.🌗 Is yellow on white easy or hard to read on a button? (a) easy to read (b) hard to read
  16. 16.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 64 px tall
    Start button: 48 px tall
    Back button: 56 px tall
    Send button: 32 px tall
  17. 17.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 68 px tall
    Next button: 36 px tall
    Help button: 64 px tall
    Back button: 48 px tall     (a) Cancel (b) Next (c) Back (d) Help
  18. 18.🔘 Is this good or poor button design: buttons almost touching? (a) poor design (b) good design
  19. 19.🔘 Our rule: buttons are at least 48 px tall. The Next button is 24 px tall. How many px taller must it be?
  20. 20.Which colour pair is easy to read? (a) pale pink on white (b) white on black (c) dark blue on black (d) light grey on white
  21. 21.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 56 px tall
    Send button: 48 px tall
    Cancel button: 36 px tall
  22. 22.Which colour pair is hard to read? (a) black on pale grey (b) black on yellow (c) white on dark green (d) dark blue on black
  23. 23.🔘 Our rule: buttons are at least 48 px tall. The Save button is 28 px tall. How many px taller must it be?
  24. 24.True or false: a big, easy tap area is good button design. (a) False (b) True
  25. 25.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
  26. 26.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 68 px tall
    Start button: 48 px tall
    Send button: 36 px tall
    Next button: 72 px tall     (a) Save (b) Send (c) Next (d) Start
  27. 27.True or false: space between buttons is good button design. (a) False (b) True
  28. 28.True or false: buttons almost touching is poor button design. (a) False (b) True
  29. 29.🔘 Our rule: buttons are at least 48 px tall. The Send button is 20 px tall. How many px taller must it be?
  30. 30.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 56 px tall
    Done button: 60 px tall
    Cancel button: 64 px tall
    Send button: 48 px tall
  31. 31.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 36 px tall
    Back button: 60 px tall
    Cancel button: 52 px tall
  32. 32.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 48 px tall
    Cancel button: 36 px tall
    Help button: 56 px tall
  33. 33.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 32 px tall
    Back button: 52 px tall
    Help button: 56 px tall
    Cancel button: 48 px tall
  34. 34.Which colour pair is hard to read? (a) white on dark green (b) white on black (c) black on yellow (d) pale pink on white
  35. 35.🌗 Is dark blue on black easy or hard to read on a button? (a) easy to read (b) hard to read
  36. 36.🔘 Our rule: buttons are at least 48 px tall. The Help button is 20 px tall. How many px taller must it be?
  37. 37.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 36 px tall
    Next button: 72 px tall
    Help button: 52 px tall
    Save button: 60 px tall     (a) Next (b) Help (c) Save (d) Cancel
  38. 38.True or false: a clear word like Save is poor button design. (a) True (b) False
  39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 56 px tall
    Save button: 56 px tall
    Send button: 24 px tall     (a) Back (b) Save (c) Send
  40. 40.🔘 Is this good or poor button design: strong colour contrast? (a) poor design (b) good design

Answer key

  1. 0
  2. 2
  3. easy to read
  4. easy to read
  5. False
  6. easy to read
  7. 0
  8. light grey on white
  9. 1
  10. False
  11. False
  12. 12
  13. Next
  14. red on green
  15. hard to read
  16. 3
  17. Next
  18. poor design
  19. 24
  20. white on black
  21. 2
  22. dark blue on black
  23. 20
  24. True
  25. good design
  26. Send
  27. True
  28. True
  29. 28
  30. 4
  31. 2
  32. 2
  33. 3
  34. pale pink on white
  35. hard to read
  36. 28
  37. Cancel
  38. False
  39. Send
  40. good design

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