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There's just a few minor changes to typography in the new Bootstrap. The most noticeable is the use of a lighter version of Helvetica for the headings. So here it is on the new version and here it is on the old version. You can see that it really lightens up the page to use a medium or semi bold weight for all the headings. The other minor things that you might notice is a few of the less variables have changed. So, for example, things like @baseFontSize have been renamed to font-size-base. And you'll find that a lot of things in Bootstrap have been prefixed to organize them a little better. Another example that you may notice is, in the emphasis section, the emphasis classes have changed a little bit.
Notice that the muted class is now called text muted, and we've also lost the text info class. Also, the text error class has been changed to text danger. That's a change that also happens in other places, so sometimes you'll see things that were called error being called danger. It's not a major thing, but it's definitely something that you need to watch out If you upgrade to a new version. So, although there's just very few changes in this typography section, I really like that the whole Bootstrap layout now uses a lighter version of the headings. It really makes everything a lot cleaner and that small change makes a big difference in readability.
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