In the next lecture Colt will introduce the Keegan Street Specificity Calculator.
If you visit the website that he uses in the video you'll notice that the calculator has some slight changes.
It's still more or less the same, but now it reads from the top down, instead of left to right, and the inline-style value was removed.
If you want to see the official W3 spec. for calculating CSS specificity, then see here.
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Thanks,
Ian