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App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 501 · 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.

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  1. 1.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 32 px tall
    Cancel button: 72 px tall
    Next button: 56 px tall     (a) Start (b) Next (c) Cancel
  2. 2.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 64 px tall
    Save button: 24 px tall
    Cancel button: 52 px tall
    Start button: 48 px tall     (a) Send (b) Start (c) Save (d) Cancel
  3. 3.🌗 Is black on yellow easy or hard to read on a button? (a) easy to read (b) hard to read
  4. 4.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Send button: 44 px tall
    Done button: 36 px tall
    Cancel button: 40 px tall
    Back button: 48 px tall
  5. 5.True or false: space between buttons is poor button design. (a) False (b) True
  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.🌗 Is yellow on white easy or hard to read on a button? (a) hard to read (b) easy to read
  8. 8.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 48 px tall
    Start button: 52 px tall
    Help button: 44 px tall
    Save button: 72 px tall     (a) Save (b) Help (c) Start (d) Send
  9. 9.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 56 px tall
    Cancel button: 72 px tall
    Back button: 24 px tall     (a) Back (b) Send (c) Cancel
  10. 10.True or false: buttons almost touching is poor button design. (a) False (b) True
  11. 11.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 20 px tall. How many px taller must it be?
  12. 12.Which colour pair is hard to read? (a) light grey on white (b) dark blue on white (c) black on yellow (d) white on black
  13. 13.True or false: a tiny 20 px button is poor button design. (a) False (b) True
  14. 14.🌗 Is pale pink on white easy or hard to read on a button? (a) hard to read (b) easy to read
  15. 15.🌗 Is light grey on white easy or hard to read on a button? (a) hard to read (b) easy to read
  16. 16.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 40 px tall
    Save button: 52 px tall
    Done button: 52 px tall
    Send button: 40 px tall
  17. 17.🔘 Our rule: buttons are at least 48 px tall. The Start button is 20 px tall. How many px taller must it be?
  18. 18.True or false: strong colour contrast is good button design. (a) True (b) False
  19. 19.True or false: a clear word like Save is poor button design. (a) True (b) False
  20. 20.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 60 px tall
    Start button: 56 px tall
    Help button: 48 px tall
  21. 21.🔘 Our rule: buttons are at least 48 px tall. The Next button is 36 px tall. How many px taller must it be?
  22. 22.🔘 Our rule: buttons are at least 48 px tall. The Start button is 44 px tall. How many px taller must it be?
  23. 23.🔘 Is this good or poor button design: strong colour contrast? (a) good design (b) poor design
  24. 24.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 36 px tall
    Done button: 32 px tall
    Help button: 40 px tall
    Start button: 64 px tall
  25. 25.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 32 px tall
    Send button: 32 px tall
    Back button: 36 px tall
    Help button: 56 px tall
  26. 26.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 48 px tall
    Cancel button: 64 px tall
    Start button: 24 px tall
    Done button: 72 px tall     (a) Next (b) Done (c) Start (d) Cancel
  27. 27.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 24 px tall
    Save button: 64 px tall
    Next button: 56 px tall     (a) Next (b) Done (c) Save
  28. 28.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Send button: 56 px tall
    Cancel button: 32 px tall
    Next button: 44 px tall
  29. 29.Which colour pair is hard to read? (a) white on black (b) dark blue on white (c) black on yellow (d) red on green
  30. 30.True or false: buttons almost touching is good button design. (a) True (b) False
  31. 31.🔘 Is this good or poor button design: grey text on grey? (a) poor design (b) good design
  32. 32.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 44 px tall
    Save button: 60 px tall
    Back button: 60 px tall
    Send button: 68 px tall     (a) Back (b) Save (c) Cancel (d) Send
  33. 33.True or false: icons with no meaning is poor button design. (a) True (b) False
  34. 34.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 48 px tall
    Help button: 64 px tall
    Cancel button: 36 px tall
    Next button: 56 px tall
  35. 35.🔘 Our rule: buttons are at least 48 px tall. The Help button is 40 px tall. How many px taller must it be?
  36. 36.Which colour pair is easy to read? (a) dark blue on black (b) light grey on white (c) white on black (d) pale pink on white
  37. 37.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 40 px tall. How many px taller must it be?
  38. 38.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 24 px tall
    Send button: 56 px tall
    Save button: 56 px tall     (a) Help (b) Send (c) Save
  39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 56 px tall
    Back button: 40 px tall
    Send button: 72 px tall     (a) Send (b) Back (c) Save
  40. 40.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 52 px tall
    Cancel button: 32 px tall
    Help button: 40 px tall

Answer key

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

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