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Bootstrap also comes with a full set of icons that have been contributed by glyph icons. To get a full listing of these icons, if you go to getbootstrap.com, click on the link on the top for Base CSS and then click on the link on the left side for icons by Glyphicons, you'll see that you have a whole list of these, 140 choices of all different shapes and sizes and indications of things. I'm going to grab this calendar icon right here, I'm just going to highlight the words icon-calendar and Ctrl+C or Command+C to copy that.
I'm going to incorporate that into my web page by putting this little icon in front of the date. So, what I'm going to do now is I'm going to hop into Dreamweaver, and I'm going to scroll on down here to the first instance of where this happens, which is here, at 9:30 to 10:30am: Elizabeth Hall, and that's where I'd like to go ahead and put this particular icon. The way you go about doing this is you're just going to put in a span tag with a class of whatever class is associated with that particular icon, and those are all displayed there on the web page.
And then you're going to follow that immediately by a slash span, so you see here the span class icon-calendar is the name of the class which we saw right here on the web pages. Those are all of the names of the classes to get those particular icons to display. Then go ahead and save--Ctrl+S or Command+S to Save--and if you put this page into Firefox, you'll see here that our icon shows up right here on the page in front of the time. So that's a nice little feature that Bootstrap ships with. But what if you don't want black? What if you want white instead? That is possible to do as well, as you'll see here inside the documentation down here at the bottom of the page, it will indicate that you can go ahead and use icon-white, which will give you the icon as well, but in the white format instead of in the dark format.
So, now if I scroll on down to the next instance here, I'm going to go ahead and put in that span tag again of icon-calendar icon-white which will give me a white version of the icon followed by a slash span. Once again, go ahead and Save this and go ahead and refresh Firefox, and you'll see the icon is there. It's very hard to see, of course, a white icon on a white background, but you can kind of see it a little bit, because the edges of the icon have been treated to blend into a dark background.
So, that's the way that you would go about incorporating icons into your document. You can go ahead and repeat this process for the rest of the page to continue incorporating icons as many as you like. Where these icons are being pulled from is inside of your file structure within Dreamweaver. Inside of your image folder, you'll notice that there are a couple of these images here, glyphicons-halflings and a white version of those. In fact, what you have here is an image sprite, so there are 140 tiny little pictures that occur in one PNG, which is a really great way of handling these tiny images for mobile phones.
Rather than having to pull down 140 individual images, in this particular case, we've only pulled down a single image and then using CSS, we target the picture that we want directly on that image, so that is where those are located. The drawback to doing it this way is that since these are image sprites and they're rasterized small images, you're not able to blow these up and use them as large-format pictures within your document. You certainly could download those kind of graphics elsewhere on the Internet and incorporate those into your Bootstrap site, but these glyph icons that ship with Bootstrap, they are image sprites, and that's the way that they work.
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