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Now the title attribute is something that's an HTML standard. You can add a title attribute to pretty much any HTML tag at all. And in Firefox at least when you roll your mouse over something it'll come up as a little browser-driven Tooltip, but what Bootstrap is doing is adding some styling to that browser-driven Tooltip to make it look really pretty. So, as you see here, the title of that is read more about vaccines, so that's where that text is coming from. If you just do this much, though. And you try putting this in your browser. You're going to see, especially if you're using Firefox.
It's a pretty handy little feature that you might find useful on your next website.
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