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flex-box: 1;

}

But in the real world, we need to be more explicit:

#parent {

display: -webkit-box;

display: -moz-box;

display: -o-box;

display: box;

}

#child {

-webkit-flex-box: 1;

-moz-flex-box: 1;

-o-flex-box: 1;

flex-box: 1;

}

HELPER CLASSES

A shortcut to all of these vendor preﬁxes — and any page that relies on the

ﬂexbox model will have many of them — is to use helper classes. I’ve

included them in the source code that accompanies this article. Here’s an

example:

.box {

display: -webkit-box;

display: -moz-box;

display: -o-box;

display: box;

}

.flex1 {

-webkit-flex-box: 1;

-moz-flex-box: 1;

-o-flex-box: 1;

flex-box: 1;

Smashing eBook #19│Mastering CSS3│ 171

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}

.flex2 {

-webkit-flex-box: 2;

-moz-flex-box: 2;

-o-flex-box: 2;

flex-box: 2;

}

This allows us to use this simple HTML:

</div>

</div>

Using non-semantic helper classes is considered bad practice by many; but

with so many vendor preﬁxes, the shortcut can probably be forgiven. You

might also consider using a “mixin” with Sass or Less, which will do the

same job. This is something that Twitter sanctions in its preboot.less ﬁle.

FLEXIE.JS

For those of you who want to start experimenting with ﬂexbox now but are

worried about IE support, a JavaScript polyﬁll is available to help you out.

Flexie.js, by Richard Herrera, is a plug-and-play ﬁle that you simply need to

include in your HTML (download it on GitHub). It will then search through

your CSS ﬁles and make the necessary adjustments for IE — no small feat

given that it is remapping much of the layout mark-up on the page.

Smashing eBook #19│Mastering CSS3│ 172

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Smashing eBook #19│Mastering CSS3│ 173

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A WORD ON FIREFOX

The ﬂexbox model was, at least originally, based on a syntax that Mozilla

used in its products. That syntax, called XUL, is a mark-up language

designed for user interfaces.

The irony here is that Firefox is still catching up, and its rendering of some

ﬂexbox properties can be buggy. Below are some issues to watch out for,

which future releases of Firefox will ﬁx. Credit here must go to the uber-

smart Peter Gasston and Oli Studholme, giants on whose shoulders I stand.

•

Flexbox ignores overflow: hidden and expands the ﬂexbox child

when the content is larger than the child’s width.

• The setting display: box is treated as display: inline-box if

there is no width.

• The outline on ﬂexbox children is padded as if by a transparent border

of the same width.

•

The setting box-align: justify does not work in Firefox.

•

If you set box-flex to 0, Firefox forces the element to act like it’s

using the quirks-mode box model.

Smashing eBook #19│Mastering CSS3│ 174

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Summary

The ﬂexbox model is another exciting development in the CSS3

speciﬁcation, but the technology is still very much cutting-edge. With buggy

support in Firefox and no support in Internet Explorer until version 10 moves

beyond the platform preview, it is perhaps of limited use in the mainstream.

Nevertheless, the spec is still a working document. So, by experimenting

with these new techniques now, you can actively contribute to its

development.

It’s hard to recommend the ﬂexbox model for production websites, but

envelopes need pushing, and it might well be the perfect way to lay out a

new experimental website or idea that you’ve been working on.

Oﬀering a range of new features that help us break free of the ﬂoat, the

ﬂexbox model is another step forward for the layout of modern Web pages

and applications. It will be interesting to see how the speciﬁcation develops

and what other delights for laying out pages await the Web design

community in the near future.

Smashing eBook #19│Mastering CSS3│ 175

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e Guide To CSS Animation: Principles

And Examples

Tom Waterhouse

With CSS animation now supported in both Firefox and Webkit browsers,

there is no better time to give it a try. Regardless of its technical form,

whether traditional, computer-generated 3-D, Flash or CSS, animation

always follows the same basic principles. In this article, we will take our ﬁrst

steps with CSS animation and consider the main guidelines for creating

animation with CSS. We’ll be working through an example, building up the

animation using the principles of traditional animation. Finally, we’ll see

some real-world usages.

Smashing eBook #19│Mastering CSS3│ 176

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CSS Animation Properties

Before diving into the details, let’s set up the basic CSS:

Animation is a new CSS property that allows for animation of most HTML

elements (such as div, h1 and span) without JavaScript or Flash. At the

moment, it’s supported in Webkit browsers, including Safari 4+, Safari for iOS

(iOS 2+), Chrome 1+ and, more recently, Firefox 5. Unsupported browsers

will simply ignore your animation code, so ensure that your page doesn’t

rely on it!

Because the technology is still relatively new, preﬁxes for the browser

vendors are required. So far, the syntax is exactly the same for each

browser, with only a preﬁx change required. In the code examples below,

we use the -webkit syntax.

All you need to get some CSS animation happening is to attach an animation

to an element in the CSS:

/* This is the animation code. */

@-webkit-keyframes example {

from { transform: scale(2.0); }

to { transform: scale(1.0); }

}

/* This is the element that we apply the animation to. */

div {

-webkit-animation-name: example;

-webkit-animation-duration: 1s;

-webkit-animation-timing-function: ease; /* ease is the

default */

-webkit-animation-delay: 1s; /* 0 is the

default */

-webkit-animation-iteration-count: 2; /* 1 is the

default */

Smashing eBook #19│Mastering CSS3│ 177

-webkit-animation-direction: alternate; /* normal is the

default */

}

First, we have the animation code itself. This can appear anywhere in the

CSS, as long as the element that you’re animating can ﬁnd the relevant

animation-name.

When assigning the animation to your element, you can also use the

shorthand:

div {

-webkit-animation: example 1s ease 1s 2 alternate;

}

We can cut this down further by not entering all of the values. Without a

value speciﬁed, the browser will fall back to the default.

Those are the basics. We’ll work through more code in the following

section.

Applying Principles of Traditional Animation

Disney — the masters of traditional animation, in my opinion — developed the

12 principles of traditional animation early on and documented them in its

famous book The Illusion of Life. These basic principles can be applied to all

manner of animation, and you needn’t be an expert in animation to follow

along. We’ll be working through an example of CSS animation that uses the

12 principles, turning a basic animation into a more believable illusion.

These may just be bouncing balls, but you can see a world of diﬀerence

between the two versions.

Smashing eBook #19│Mastering CSS3│ 178

This example demonstrates the features of CSS animation. In the code

below, we use empty divs to show how it works; this isn’t the most semantic

way to code, as we all know, but the point is to show how simple it is to

bring a page to life in a way that we haven’t been able to do before in the

browser.

SQUASH AND STRETCH

Smashing eBook #19│Mastering CSS3│ 179

The crude bouncing ball is a great demonstration of this ﬁrst point. If the ball

falls at a high velocity and hits the ﬂoor, you’ll see it squash down from the

force and then stretch back out as it bounces up.

At a basic level, this should give our animation a sense of weight and

ﬂexibility. If we dropped a bowling ball, we wouldn’t expect it to ﬂex at all — it

might just damage the ﬂoor.

We can apply this squash and stretch eﬀect through a CSS3 property,

transform:

@-webkit-keyframes example {

0% { -webkit-transform: scaleY(1.0); }

50% { -webkit-transform: scaleY(1.2); }

100% { -webkit-transform: scaleY(1.0); }

}

This will scale the object lengthwise (on the y axis, up and down) to 1.2 times

the original size, and then revert to the original size.

We’re also using more complex timing for this animation. You can use from

and to for basic animations. But you can also specify many actions for your

animation using percentages, as shown here.

That covers the squashing. Now we need to move the object using

translate. We can combine transforms together:

50% {

-webkit-transform: translateY(-300px) scaleY(1.2);

}

Smashing eBook #19│Mastering CSS3│ 180

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