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Paul Neumyer15,301 Points
Flexbox with Sass
Would this video be a little outdated with the rise of browser support for Flexbox CSS Layout? It just seems easier to use Flexbox then writing all these Sass statements for Floats, and Horizontal Lists, when Flexbox will solve this.
Cameron Cottle13,742 Points
As Kevin said, you should never rely on new spec, simply because anyone using an older version will instead see a broken page.
According to caniuse.com IE9 does not support Flex-box and IE10 requires a vendor prefix. With conditional CSS or tools like Modernizr you can create navigation styles using flex-box for the browsers that support it, and a fallback for those that don't.
Kevin Korte28,148 Points
Today, I still think it's important to understand both. Based on your expected users and what browsers they might use, I wouldn't rely on Flexbox solely just yet. I know at work some of our workstations are still running IE8, and there are no plans to upgrade them. They don't know any better.
Maybe in 12-16 months these videos might be considered outdated.