What do you know about grid system?

Grids enable you to build solid structure and form into your designs.Grids aren’t just useful for us as designers or developers - they’re good for the user, too. 

A grid system is a way of providing a system that designers can work with to structure and present content and imagery in a much more readable, manageable way.

The responsibility is with you to create a design that is unique and has something different to it - and a grid system should be seen as something that will enable you to do that, rather than restrict you.

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Can you explain "visibility:hidden" and "display:none"?

Display:none - means that the tag in question will not appear on the page at all (although you can still interact with it through the dom). There will be no space allocated for it between the other tags.

visibility:hidden means that unlike display:none, the tag is not visible, but space is allocated for it on the page. The tag is rendered, it just isn't seen on the page.

For example:

test | <span style="[style-tag-value]">Appropriate style in this tag</span> | test

Replacing [style-tag-value] with display:none results in:

test |   | test

Replacing [style-tag-value] with visibility:hidden results in:

test |                        | test

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