960 grid system with 12 columns for Responsive Web Design. PSD file which has the 960 grid setup for you based on 32px gutters/margins.
Offsetting columns - if you need to position a column over by say 2 columns.
Four main media queries:
1. browsers over 960px
2. iPad or other tablet Portrait (728px)
3. iPhone or mobile Portrait (300px)
4. iPhone or mobile Landscape (420px)
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