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Using IDs instead of Classes
In this video, he uses IDs instead of Classes. In every other html/css video I've watched on Treehouse, classes are used instead of IDs for the same kinds of things he did.
Kevin Korte28,148 Points
You're assumptions are correct, not sure why IDs were used. It's best to use classes for styling and ids to target unique dom elements.
jason chan31,009 Points
IDs are easier selectors to use. Use a Class if you want to use it elsewhere, most css frameworks are written classes. If not creating a css rule selector would be way longer. Just think ID is unique selector
IDs as selectors is a 'violation' of CSS Lint and general best practices. However, there are exceptions to every rule, and these are guidelines, not laws.
So, when in doubt, go with a class. However, if you truly 100% know that your element is 'one-of-a-kind' and will never be used on another page in your site, cut through the chatter and just use IDs.
Usually on our projects, if we 'break' a rule (e.g. linting), it's okay as long as we put a 'designer's note' comment stating why we are doing so.
That way, it is not construed as ignorance or laziness, but is deliberate.