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CSS : Layout, Responsive Design, positioning elements, normal flow,…

- - - - entire content within a div : container, main, wrapper
- - - - width of the viewport
    - - height of the viewport
    - - width of the device
    - - height of the device
    - - whether the device is portrait or landscape
    - - the number of bits per color
- - - - a block-level element whose position is fixed, relative or absolute)
- - - - elements whose content are defined by some external resource e.g. <img>
      - have a width and height defined by external resource - regular box model
    - - elements whose content is defined within the document
      - have a constrained box model
- - - - left, right, both, none
      - overflow: auto
      - clearfix
- - - - adding this additional class element .hide