App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 423 · 40 questions

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.

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

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