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The last pieces of the border-image declaration are the size and style: 5

5 5 5 stretch. The repeated 5s determine the size on each side of the

object; because we wanted a 5-pixel border, we created an image that was

15 x 15. If we had used a smaller image, the browser would have had to

scale the corners as well, and no doubt it would have looked messier. The

last property, stretch, dictates how the browser actually handles the

pieces of the image. A great (and amusing) intro to the diﬀerent styles can

be found at lrbabe.

PUTTING IT TOGETHER

Combining the frame with the glass overlay center (which is a semi-

transparent PNG) gives us our frame. Using diﬀerent border images, we

actually created classes for our diﬀerent colors (red, blue, etc.), while older

browsers still get a usable frame without the gradient-edged niceties. This

isn’t an incredibly complex example, but you can see how useful border-

image can be, especially using an alpha-mapped image format such as

PNG.

Smashing eBook #19│Mastering CSS3│ 101

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We’ve created a live demo page for this gallery in our Playground so that

you can see it in action and delve deeper into the source code. You can also

read up on why we created this overlay in our two-part Notable Behind the

Scenes blog post: part 1

and part 2

CSS 3 Is Totally Bad Ass

Right? We hope you’ve enjoyed this primer on what we can look forward to

in the ﬁnal CSS3 speciﬁcation. Familiarize yourself with the properties and

start using them—just be sure to account for browsers that, sadly, will never

support all of these fun new tricks. You can see how we use CSS3 in our

work for clients as well as in our own product, Notable. Found a super-

awesome way to use these new properties? We’d love to hear about it in the

comments!

Smashing eBook #19│Mastering CSS3│ 102

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Adventures In e ird Dimension: CSS

3D Transforms

Peter Gasston

Back in 2009, the WebKit development team proposed a new extension to

CSS that would allow Web page elements to be displayed and transformed

on a three-dimensional plane. This proposal was called 3D Transforms, and

it was soon implemented in Safari for Mac and iOS. About a year later,

support followed for Chrome, and early in 2011, for Android. Outside of

WebKit, however, none of the other browser makers seemed to show much

enthusiasm for it, so it’s remained a fairly niche and underused feature.

That’s set to change, though, as the Firefox and Internet Explorer teams

have decided to join the party by implementing 3D Transforms in pre-

release versions of their browsers. So, if all goes according to plan, we’ll see

them in IE 10 and a near-future version of Firefox (possibly 10 or 11, but that’s

not conﬁrmed yet), both of which are slated for release sometime this year.

That being the case, this is an ideal time to get ahead of the curve and start

learning about the possibilities and potential of adding an extra dimension to

your Web pages. This article aims to help you do just that, by taking you on

a ﬂying tour of the 3D Transforms syntax.

Please bear in mind that in order to see the examples in this article, you’ll

need a browser that supports 3D Transforms; as I write this, that’s Safari,

Chrome, IE 10 Platform Preview or Firefox Aurora.

Smashing eBook #19│Mastering CSS3│ 103

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e ird Dimension

On the Web, we’re accustomed to working in two dimensions: all elements

have width and height, and we move them around the screen horizontally

(left to right) and vertically (top to bottom). The move to a third dimension

can be thought of as adding depth to elements, and adding movement

towards and away from you (the viewer). Think about 3D ﬁlms in which

objects are constantly thrust out of the screen towards you in an attempt to

demonstrate the possibilities of the extra depth.

To use 3D Transforms in CSS, you’ll need to know about axes (that’s the

plural of axis, not the plural of axe). If you already know about working in

three dimensions or remember using axes in math class at school, you can

skip the next section. For everyone else, here is…

A Quick Primer On Axes

I just mentioned that on the 2-D Web, we move elements around

horizontally and vertically. Each of these directions is called an axis: the

horizontal line is known as the x-axis, and the vertical line is the y-axis. If we

think of the top-left corner of an element as our origin (i.e. the point from

which movement is measured), a movement to the left is a negative

movement along the x-axis, and a move to the right is a positive movement

along the x-axis. The same goes for moving an element up (negative on the

y-axis) and down (positive on the y-axis).

Smashing eBook #19│Mastering CSS3│ 104

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The third dimension is known as the z-axis and, as I said, can be thought of

as towards or away from you; a negative movement along the z-axis is away

from you, and a positive movement is towards you.

Showing the three axes: x (left-right), y (up-down) and z (away-towards).

If you’ve read all of this talk of axes and negative movements and you’re

rubbing your eyes and blinking in disbelief and misunderstanding, don’t

worry: it will all become clear when you get stuck in the code. Come back

and read this again after a few examples and it should all be clear.

Smashing eBook #19│Mastering CSS3│ 105

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Transformation Functions

The various transformations are all applied with a single CSS property:

transform — yes, the same property that’s used for 2-D CSS Transforms.

At the moment, this property is still considered experimental, so remember

to use all of the browser preﬁxes, like so:

div {

-moz-transform: foo;

-ms-transform: foo;

-o-transform: foo;

-webkit-transform: foo;

}

Note that Opera doesn’t currently have an implementation of 3D Transforms,

but I’m including it here because work is apparently underway. For the sake

of clarity, in the examples throughout this article, I’ll use only non-preﬁxed

properties, but remember to include all of the preﬁxed ones in your own

code.

Anyway, the transform property accepts a range of functions as values,

each of which applies a diﬀerent transformation. If you’ve used 2-D CSS

Transforms, then you’ll already know many of these functions because they

are quite similar (or, in some cases, the same). Here are all of the 3D

functions:

•matrix3d

•perspective

•

rotateX

rotateY

rotateZ

rotate3d

•scaleX

scaleY

scaleZ

scale3d

•

translateX

translateY

translateZ

translate3d

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Now, matrix3d deﬁnitely sounds the coolest, but it’s so unbelievably

complex (it takes 16 values!) that there’s no way I could cover it in this article.

So, let’s put that aside and take a quick look at the others.

ROTATION

To explain what this does, I’ll have to ask you to do a little mental exercise

(which will come in useful later in the article, too). Imagine a sheet of card

with a string running through the middle that ﬁxes it in place. By taking the

top corners in your ﬁngers, you can move the card up and down, left and

right, and forwards and backwards, pivoting around the string. This is what

the rotate() function does. The individual functions rotateX(),

rotateY() and rotateZ() take a deg (i.e. degree) value and move the

element around its point of origin (where the string passes through it) by that

much.

Have a look at our ﬁrst example (a screenshot is shown below in case you

don’t have access to a supported browser). Here we’ve rotated each of the

elements 45° around a diﬀerent axis (in order: x, y, z), so you can see the

eﬀect of each. The semi-translucent red box shows the original position of

the element, and if you mouse over each, you’ll see the transformations

removed (I’ve used this convention in all of the examples in this article).

Smashing eBook #19│Mastering CSS3│ 107

Each element is rotated 45° around a diﬀerent axis: x (left), y (center) and z (right).

There is a rotate3d() function as well, but it’s too complex to explain in a

brief article like this one, so we’ll skip it.

TRANSLATION

This is really just a fancy way of saying “movement.” The functions

translateX(), translateY() and translateZ() each take a length

value, which moves the element by that distance along the given axis. So,

translateX(2em) would move the element 2 ems to the right, and

translateZ(-10px

)

would move the element 10 pixels away from the

viewer. There’s also a shorthand function, translate3d(), which takes

three values in order, one for each axis, like so: translate3d(x, y, z).

In our second example, we’ve translated each of the elements by -20 pixels

along a diﬀerent axis (in order: x, y, z).

Smashing eBook #19│Mastering CSS3│ 108

Each element is translated by -20 pixels along a diﬀerent axis: x (left), y (center)

and z (right).

Note that translation of an element is similar to relative positioning, in that it

doesn’t aﬀect the document’s ﬂow. The translated element will keep its

position in the ﬂow and will only appear to have moved, meaning it might

cover or show through surrounding elements.

SCALING

This just means making bigger or smaller. The three functions scaleX(),

scaleY() and scaleZ() each take a unitless number value, which is used

as a multiplier. For scaleX() and scaleY(), this is applied directly to the

width and height; for example, applying scaleY(1.5) to an element with a

height of 100 pixels would transform it to 150 pixels high, and applying

scaleX(0.75) to an element with a width of 100 pixels would transform it

to 75 pixels wide.

The scaleZ() function behaves slightly diﬀerently. Transformed elements

don’t actually have any depth to increase or decrease; what we’re doing is

more like moving a 2-D object around in 3D space. Instead, the value given

to scaleZ() acts as a multiplier for the translateZ() function that I

Smashing eBook #19│Mastering CSS3│ 109

explained in the last section. So, applying both translateZ(10px) and

scaleZ(2) would translate an element 20 pixels along the z-axis.

There’s also a shorthand property, scale3d(), which, like

translate3d(), takes three values, one for each of the individual

functions: scale3d(x,y,z). So, in the following code example, the same

transformation applies to both of the elements:

.e1 {

transform: scaleX(1.5) scaleY(1.5) scaleZ(0.75);

}

.e2 {

transform: scale3d(1.5,1.5,0.75);

}

PERSPECTIVE

The perspective() function is quite simple, but what it actually does is

quite complex. The function takes a single value, which is a length unit

greater than 0 (zero). Explaining this is a little complicated; the length is like

a distance between you and the object that you’re viewing (a tutorial on

Eleqtriq has a more technical explanation and diagram). For our purposes,

you just need to know that the lower the number, the more extreme the 3D

eﬀect will appear; any value below 200px, for example, will make the

transformation appear very exaggerated, and any value of 1000px or more

will seem to have no eﬀect at all.

In our third example, we have three transformed elements, each with a

diﬀerent value for the perspective() function: 25px, 50px and 200px,

respectively. Although the diﬀerence between the three is very discernible,

it’s even clearer when you mouse over to see the transformations removed.

Smashing eBook #19│Mastering CSS3│ 110

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