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Each element has a diﬀerent value for the perspective() function: 25px (left), 50px

(center) and 200px (right).

Note that I’ve transformed the parent elements (equally) so that we can see

the degree of perspective more clearly; sometimes the diﬀerence in

perspective values can be imperceptible.

Other Properties

In addition to transform, you’ll need to know about a few other important

properties.

TRANSFORM-STYLE

If you’ll be applying 3D transformations to the children of an already

transformed element, then you’ll need to use this property with the value

preserve-3d (the alternative, and default, is flat). This means that the

child elements will appear on their own planes; without it, they would appear

ﬂat in front of their parent.

Our fourth example clearly illustrates the diﬀerence; the element on the left

has the flat value, and on the right, preserve-3d.

Smashing eBook #19│Mastering CSS3│ 111

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The element on the left has a transform-style value of flat, and the one on

the right has a value of preserve-3d

Something else to note is that if you are transforming child elements, the

parent must not have an overflow value of hidden; this would also force

the children into appearing on the same plane.

TRANSFORM-ORIGIN

As mentioned, when you apply a transformation to an element, the change

is applied around a point directly in the horizontal and vertical middle — like

the imaginary piece of string we saw in the earlier illustration. Using

transform-origin, you can change this to any point in the element.

Acceptable values are pairs of lengths, percentages or positional keywords

(top, right, etc.). For example:

div {

transform-origin: right top;

}

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In our ﬁfth example, you can see the same transformations applied to two

elements, each of which has a diﬀerent transform-origin value.

The element on the left has a

transform-origin

value of

center

, and the one on the right has a value of

right top.

The diﬀerence is clearly visible, but even more obvious if you pass the

mouse over to see the transformation removed.

BACKFACE-VISIBILITY

Depending on which transformation functions you apply, sometimes you will

move an element around until its front (or “face”) is angled away from you.

When this happens, the default behavior is for the element to be shown in

reverse; but if you use backface-visibility with a value of

hidden

you’ll see nothing instead, not even a background color.

Smashing eBook #19│Mastering CSS3│ 113

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PERSPECTIVE AND PERSPECTIVE-ORIGIN

We introduced the perspective() function earlier, but the perspective

property takes the same values; the diﬀerence is that the property applies

only to the children of the element that it’s used on, not the element itself.

The perspective-origin property changes the angle from which you

view the element that’s being transformed. Like transform-origin, it

accepts lengths, percentages or positional keywords, and the default

position is the horizontal and vertical middle. The eﬀect of changing the

origin will be more pronounced the lower the

perspective

value is.

Conclusion

By necessity, we’ve ﬂown through the intricacies of the 3D transformations

syntax, but hopefully I’ve whetted your appetite to try it out yourself. With a

certain amount of care for older browser versions, you can implement these

properties in your own designs right now. If you don’t believe me, compare

the list of “More adventures” on The Feed website that I built last year in a

browser that supports 3D transforms and in one that doesn’t, and you’ll see

what I mean.

Some of the concepts used in 3D transforms can be quite daunting, but

experimentation will soon make them clear to you in practice, so get ahold

of a browser that supports them and start making some cool stuﬀ. But

please, be responsible: not everything on the Web needs to be in three

dimensions!

Smashing eBook #19│Mastering CSS3│ 114

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How To Use CSS3 Pseudo-Classes

Richard Shepherd

CSS3 is a wonderful thing, but it’s easy to be bamboozled by the transforms

and animations (many of which are vendor-speciﬁc) and forget about the

nuts-and-bolts selectors that have also been added to the speciﬁcation. A

number of powerful new pseudo-selectors (16 are listed in the latest W3C

spec) enable us to select elements based on a range of new criteria.

Smashing eBook #19│Mastering CSS3│ 115

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Before we look at these new CSS3 pseudo-classes, let’s brieﬂy delve into

the dusty past of the Web and chart the journey of these often

misunderstood selectors.

A Brief History Of Pseudo-Classes

When the CSS1 spec was completed back in 1996, a few pseudo-selectors

were included, many of which you probably use almost every day. For

example:

•:link

•:visited

•:hover

•:active

Each of these states can be applied to an element, usually <a>, after which

comes the name of the pseudo-class. It’s amazing to think that these

pseudo-classes arrived on the scene before HTML4 was published by the

W3C a year later in December 1997.

CSS2 ARRIVES

Hot on the heels of CSS1 was CSS2, whose recommended spec was

published just two years later in May 1998. Along with exciting things like

positioning were new pseudo-classes: :first-child and :lang().

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:lang

There are a couple of ways to indicate the language of a document, and if

you’re using HTML5, it’ll likely be by putting <html lang="en"> just after

the doc type (specifying your local language, of course). You can now

use :lang(en) to style elements on a page, which is useful when the

language changes dynamically.

:first-child

You may have already used :first-child in your documents. It is often

used to add or remove a top border on the ﬁrst element in a list. Strange,

then, that it wasn’t accompanied by :last-child; we had to wait until

CSS3 was proposed before it could meet its brother.

WHY USE PSEUDO-CLASSES?

What makes pseudo-classes so useful is that they allow you to style

content dynamically. In the <a> example above, we are able to describe

how links are styled when the user interacts with them. As we’ll see, the new

pseudo-classes allow us to dynamically style content based on its position in

the document or its state.

Sixteen new pseudo-classes have been introduced as part of the W3C’s

CSS Proposed Recommendation, and they are broken down into four

groups: structural pseudo-classes, pseudo-classes for the states of UI

elements, a target pseudo-class and a negation pseudo-class.

Smashing eBook #19│Mastering CSS3│ 117

The W3C is the home of CSS.

Let’s now run through the 16 new pseudo-selectors one at a time and see

how each is used. I’ll use the same notation for naming classes that the W3C

uses, where E is the element, n is a number and

is a selector.

SAMPLE CODE

For many of these new selectors, I’ll also refer to some sample code so that

you can see what eﬀect the CSS has. We’ll take a regular form and make it

suitable for an iPhone using our new CSS3 pseudo-classes.

Note that we could arguably use ID and class selectors for much of this form,

but it’s a great opportunity to take our new pseudo-classes out for a spin

and demonstrate how you might use them in a real-world example. Here’s

the HTML (which you can see in action on my website):

<form>

Smashing eBook #19│Mastering CSS3│ 118

<h1>Awesome Widgets</h1>

</hgroup>

<legend>Where do we send your receipt?</legend>

<label for="email">Email Address</label>

<input type="email" name="email" placeholder="Email

Address" />

</fieldset>

<legend>Personal Details</legend>

<option value="" selected="selected">Title</option>

</select>

<label for="firstname">First Name</label>

<label for="initial">Initial</label>

<label for="surname">Surname</label>

</fieldset>

<legend>Payment Details</legend>

<label for"cardnumber">Card number</label>

<option value="" selected="selected">Select Card Type</

option>

<option value="2">American Express</option>

<option value="3">MasterCard</option>

</select>

Smashing eBook #19│Mastering CSS3│ 119

<label for="cardExpiryMonth">Expiry Date</label>

</select> /

</select>

<label for"securitycode">Security code</label>

<input name="securitycode" type="number"

placeholder="Security code" size="3" />

<p>Would you like Insurance?</p>

<label for="insuranceYes">Yes Please!</label>

<label for="insuranceNo">No thanks</label>

</fieldset>

Smashing eBook #19│Mastering CSS3│ 120

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