- training material: https://www.w3schools.com/bootstrap
- section Bootstrap Tutorial, BS Home
- target: mobile devices - size, device orientation, screen touch
- simulate the demo in the desktop
- by change the desktop screen size
- When the size is bigger, three divs are layout horizontally.
- When the size is bigger, three divs are layout vertically.
- You can not test the orientation change.
- no test on touch.
- The code is as below.
- the libraries
- meta tag
- class: container, row, col_sm_4