Viewport
<meta name="viewport" content=-"width=device-width,initial-scale=1">
Media query and breakpoint
@media screen and (max|min-width:400px){css}
FlexBox
display: flex;
flex-wrap: wrap;
Column Drop
Mostly Fluid
Layout Shifter
Off Canvas
Reference
- http://www.lukew.com/ff/entry.asp?1514
- https://www.udacity.com/course/progress#!/c-ud893