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App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 680 · 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. The Help button is 44 px tall. How many px taller must it be?
  2. 2.True or false: grey text on grey is poor button design. (a) False (b) True
  3. 3.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 52 px tall
    Save button: 56 px tall
    Start button: 64 px tall
    Send button: 44 px tall     (a) Send (b) Save (c) Cancel (d) Start
  4. 4.🔘 Our rule: buttons are at least 48 px tall. The Start button is 28 px tall. How many px taller must it be?
  5. 5.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 24 px tall
    Start button: 48 px tall
    Send button: 48 px tall     (a) Next (b) Send (c) Start
  6. 6.🌗 Is yellow on white 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?
    Start button: 64 px tall
    Send button: 32 px tall
    Next button: 60 px tall
  8. 8.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 60 px tall
    Save button: 32 px tall
    Help button: 64 px tall
    Send button: 32 px tall
  9. 9.Which colour pair is hard to read? (a) black on yellow (b) white on dark green (c) light grey on white (d) dark blue on white
  10. 10.🔘 Is this good or poor button design: a big, easy tap area? (a) poor design (b) good design
  11. 11.🔘 Our rule: buttons are at least 48 px tall. The Done button is 28 px tall. How many px taller must it be?
  12. 12.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 64 px tall
    Save button: 32 px tall
    Help button: 48 px tall     (a) Help (b) Cancel (c) Save
  13. 13.🔘 Our rule: buttons are at least 48 px tall. The Start button is 44 px tall. How many px taller must it be?
  14. 14.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 64 px tall
    Next button: 28 px tall
    Save button: 56 px tall     (a) Done (b) Next (c) Save
  15. 15.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 20 px tall. How many px taller must it be?
  16. 16.🔘 Our rule: buttons are at least 48 px tall. The Send button is 44 px tall. How many px taller must it be?
  17. 17.🔘 Our rule: buttons are at least 48 px tall. The Start button is 36 px tall. How many px taller must it be?
  18. 18.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 52 px tall
    Help button: 44 px tall
    Next button: 36 px tall
  19. 19.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 68 px tall
    Start button: 64 px tall
    Back button: 32 px tall     (a) Back (b) Help (c) Start
  20. 20.🔘 Our rule: buttons are at least 48 px tall. The Back button is 20 px tall. How many px taller must it be?
  21. 21.Which colour pair is easy to read? (a) pale pink on white (b) light grey on white (c) black on pale grey (d) dark blue on black
  22. 22.🔘 Our rule: buttons are at least 48 px tall. The Send button is 32 px tall. How many px taller must it be?
  23. 23.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 36 px tall
    Start button: 52 px tall
    Back button: 40 px tall
    Save button: 32 px tall
  24. 24.🌗 Is pale pink on white easy or hard to read on a button? (a) hard to read (b) easy to read
  25. 25.Which colour pair is easy to read? (a) light grey on white (b) dark blue on white (c) dark blue on black (d) yellow on white
  26. 26.Which colour pair is hard to read? (a) red on green (b) white on dark green (c) black on pale grey (d) black on yellow
  27. 27.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 56 px tall
    Cancel button: 40 px tall
    Next button: 60 px tall     (a) Next (b) Done (c) Cancel
  28. 28.🌗 Is white on black easy or hard to read on a button? (a) easy to read (b) hard to read
  29. 29.🔘 Is this good or poor button design: a clear word like Save? (a) good design (b) poor design
  30. 30.Which colour pair is hard to read? (a) white on black (b) black on yellow (c) white on dark green (d) yellow on white
  31. 31.Which colour pair is easy to read? (a) dark blue on black (b) light grey on white (c) pale pink on white (d) black on yellow
  32. 32.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 24 px tall
    Start button: 72 px tall
    Save button: 64 px tall
    Next button: 48 px tall     (a) Next (b) Save (c) Start (d) Back
  33. 33.Which colour pair is easy to read? (a) yellow on white (b) white on black (c) pale pink on white (d) red on green
  34. 34.🔘 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
    Send button: 44 px tall
    Next button: 32 px tall
  35. 35.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 48 px tall
    Send button: 56 px tall
    Cancel button: 60 px tall
    Back button: 32 px tall
  36. 36.Which colour pair is hard to read? (a) dark blue on white (b) black on pale grey (c) white on black (d) dark blue on black
  37. 37.Which colour pair is easy to read? (a) white on dark green (b) pale pink on white (c) light grey on white (d) yellow on white
  38. 38.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
  39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 48 px tall
    Next button: 40 px tall
    Start button: 52 px tall
    Send button: 52 px tall     (a) Next (b) Start (c) Send (d) Help
  40. 40.True or false: space between buttons is good button design. (a) True (b) False

Answer key

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

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