Screen Size Testing
Visible when screen has less than 641 display units horizontally
Visible when screen has 641 or more display units horizontally
Visible when screen has less than 801 display units horizontally
Visible when screen has 801 or more display units horizontally
Visible when screen has less than 1001 display units horizontally
Visible when screen has 1001 or more display units horizontally
Visible when screen has less than 1201 display units horizontally
Visible when screen has 1201 or more display units horizontally