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App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 255 · 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.🌗 Is pale pink on white easy or hard to read on a button? (a) hard to read (b) easy to read
  2. 2.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 32 px tall
    Done button: 44 px tall
    Start button: 36 px tall
    Next button: 48 px tall
  3. 3.True or false: strong colour contrast is poor button design. (a) True (b) False
  4. 4.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
  5. 5.🌗 Is black on pale grey easy or hard to read on a button? (a) easy to read (b) hard to read
  6. 6.🔘 Our rule: buttons are at least 48 px tall. The Start button is 24 px tall. How many px taller must it be?
  7. 7.Which colour pair is easy to read? (a) yellow on white (b) red on green (c) black on yellow (d) dark blue on black
  8. 8.True or false: icons with no meaning is poor button design. (a) False (b) True
  9. 9.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
  10. 10.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 20 px tall. How many px taller must it be?
  11. 11.True or false: a clear word like Save is poor button design. (a) False (b) True
  12. 12.True or false: space between buttons is poor button design. (a) False (b) True
  13. 13.🔘 Our rule: buttons are at least 48 px tall. The Back button is 28 px tall. How many px taller must it be?
  14. 14.True or false: grey text on grey is good button design. (a) True (b) False
  15. 15.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 36 px tall. How many px taller must it be?
  16. 16.True or false: a tiny 20 px button is poor button design. (a) False (b) True
  17. 17.True or false: a tiny 20 px button is good button design. (a) True (b) False
  18. 18.Which colour pair is hard to read? (a) black on pale grey (b) white on black (c) dark blue on black (d) white on dark green
  19. 19.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 60 px tall
    Save button: 64 px tall
    Send button: 24 px tall
    Help button: 64 px tall     (a) Help (b) Done (c) Send (d) Save
  20. 20.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 68 px tall
    Start button: 40 px tall
    Help button: 60 px tall     (a) Start (b) Done (c) Help
  21. 21.🌗 Is dark blue on white easy or hard to read on a button? (a) easy to read (b) hard to read
  22. 22.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 52 px tall
    Back button: 48 px tall
    Cancel button: 56 px tall
  23. 23.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 32 px tall. How many px taller must it be?
  24. 24.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 64 px tall
    Back button: 36 px tall
    Start button: 32 px tall
    Done button: 60 px tall
  25. 25.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 40 px tall
    Send button: 36 px tall
    Done button: 40 px tall
    Save button: 44 px tall
  26. 26.🌗 Is dark blue on black easy or hard to read on a button? (a) hard to read (b) easy to read
  27. 27.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 36 px tall
    Next button: 52 px tall
    Done button: 60 px tall
    Start button: 44 px tall
  28. 28.🌗 Is white on black easy or hard to read on a button? (a) hard to read (b) easy to read
  29. 29.🔘 Is this good or poor button design: a big, easy tap area? (a) poor design (b) good design
  30. 30.🔘 Our rule: buttons are at least 48 px tall. The Start button is 40 px tall. How many px taller must it be?
  31. 31.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 28 px tall
    Next button: 72 px tall
    Cancel button: 60 px tall
    Start button: 72 px tall     (a) Back (b) Next (c) Cancel (d) Start
  32. 32.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 48 px tall
    Save button: 52 px tall
    Next button: 40 px tall
  33. 33.🔘 Is this good or poor button design: icons with no meaning? (a) good design (b) poor design
  34. 34.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 60 px tall
    Save button: 36 px tall
    Cancel button: 36 px tall
  35. 35.🌗 Is black on yellow 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. Which button is too small?
    Send button: 40 px tall
    Start button: 52 px tall
    Done button: 48 px tall     (a) Start (b) Send (c) Done
  37. 37.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 56 px tall
    Done button: 24 px tall
    Back button: 64 px tall     (a) Done (b) Back (c) Start
  38. 38.🔘 Our rule: buttons are at least 48 px tall. The Send button is 24 px tall. How many px taller must it be?
  39. 39.🔘 Our rule: buttons are at least 48 px tall. The Back button is 24 px tall. How many px taller must it be?
  40. 40.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 64 px tall
    Done button: 64 px tall
    Save button: 28 px tall     (a) Done (b) Back (c) Save

Answer key

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

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