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Granted, CSS Transitions and Transforms can be so much eye candy, not that there is anything wrong with the occasional bit of sweetening. However, in this movie, I'm going to demonstrate a technique that is both straightforward and practical by applying CSS transitions to the font size property. What happens when the user encounters a part of the web page that's too small to read? Like, for example, the privacy statement on the bottom of this file, which is the index.htm file found in the Chapter 2/ 02_05 folder of the exercise files.
Now in order to read this, you can squint, you can zoom in using the browser's View menu item. But every time you do that, everything gets bigger and is still difficult to read. Let me go back to the actual size. Or if their operating system supports a magnified function like the Mac OS X does, they can use that. So I'm going to press Ctrl and use my scroll wheel to zoom in, and as you can see, that kind of works, but then you get into scrolling issues.
Let's address the problem by adding a transition to increase the font size of the smallest text on hover. For that we will switch over to our code editor and open up the associated stylesheet main.css found in the Chapter 2/02_05/_css folder. So now I'm going to scroll to the bottom of the page where the footer rules reside, and in the footer #privacy p for paragraph rule, as you see at the very bottom on line 679, I'll add in my transition declarations -webkit-transition, and now let's name the property font-size.
Let's have the transition happen in half a second with an ease timing function, and now I am ready to copy that line and paste it in, three times and change it up to get the vendor specific references in there, -moz for Mozilla, -o for Opera, and then removing it to have the generic CSS3 property transition, okay. So all we need to do now is to create a rule for the hover state for that exact same selector. So let me just go ahead and copy the selector--as you can see, I'm a very big fan of the copy/paste--and we will add the hover state to the paragraph and start our rule.
It is only one line that we need here, and that's font-size: 1em. Now you'll notice that in its plain state, font size is set to just half an em. So we should see the privacy statement grow to double its size. So I'll save my file, and then let's go over to our browser and reload the page, and now let me scroll down just a little bit, and now as I hover over it, the entire area zooms in, and it's far easier to read.
And you can certainly play with the size and duration, but there's no doubt that it enhances the user experience. You may be wondering why I increased the font size rather than resize the text with the scale transform. When you scale and element, some browsers treat the page element as a graphic, which can result in fuzzy text. For pure text resizing, it's best to stick with the font-size transition.
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