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He's a former NRL player and the host of The Amazing Race Australia.

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Emulating background image crop, background image opacity, background transforms, and improved background positioning. A few hacks relying on CSS pseudo-elements to emulate features unavailable or not yet widely supported by modern browsers.

Demos: Example CSS background image hacks

Pseudo-element hacks can fill some gaps in existing browser support for CSS features, without resorting to presentational HTML. In some cases, they even make it possible to emulate things that are not currently part of any W3C working draft, like background transforms and background image opacity.

Most of the hacks in this article tie in with the pseudo-element hack described in an earlier article – Multiple Backgrounds and Borders with CSS 2.1. That article already describes how to emulate multiple background support and its demo page shows several other uses of the basic principle. This article presents a few of those effects and applications in greater detail.

Emulating background-crop

Known support: Firefox 3.5+, Opera 10+, Safari 4+, Chrome 4+, IE 8+

Demo: Pseudo background-crop

Background image cropping can be emulated in modern browsers using only CSS 2.1. The principle behind a pseudo background-crop is to apply a background-image to a pseudo-element rather than the element itself. One example would be to crop an image to display in the background. Another would be to crop an image sprite to display icons alongside text in links.

In several cases, using pseudo-elements may have advantages over existing, alternative techniques because it combines their strengths and avoids some of their weaknesses.

Google, Facebook, and Twitter all make use of empty DOM elements to crop dense sprites and display icons next to certain links in their interfaces. The alternative is not to use empty elements but be forced into using multiple images and/or to design sub-optimal image sprites that have their component images spaced out.

Pseudo-elements can be used in much the same way as empty DOM elements. This simultaneously eliminates the need for presentational HTML and doesn’t depend so heavily on an image sprite’s design. Using pseudo-elements for this purpose does have its own drawback – a lack of support in legacy browsers like IE6 and IE7. However, the technique will progressively enhance capable browsers while leaving a perfectly usable experience for incapable browsers.

Example code: cropping a sprite

This example shows how to crop icons that are part of a dense image sprite that uses a 16px × 16px grid. It uses a simple list and specifies a class for each type of action.

<ul class="actions">
  <li class="save"><a href="#">Save</a></li>
  <li class="delete"><a href="#">Delete</a></li>
  <li class="share"><a href="#">Share</a></li>
  <li class="comment"><a href="#">Comment</a></li>
</ul>

Styling can be applied to present this list in whatever way is needed. From that base, a pseudo-element can be created and then treated as you would an empty, inline DOM element (e.g. <span>).

In this case, the :before pseudo-element is used and sized to match the sprite’s grid unit. It could be sized to whatever dimensions are required to match a section of the sprite that needs to be cropped.

.actions a:before {
  content: "";
  float: left;
  width: 16px;
  height: 16px;
  margin: 0 5px 0 0;
  background: url(sprite.png);
}

.save a:before { background-position: 0 -16px; }
.delete a:before { background-position: 0 -32px; }
.share a:before { background-position: 0 -48px; }
.comment a:before { background-position: 0 -64px; }

Providing hover, focus, active, and “saved” states is just a case of declaring the correct background position in each case.

.save a:hover:before,
.save a:focus:before,
.save a:active:before {
  background-position: -16px -16px;
}

.saved a:before {
  background-position: -32px -16px;
}

Future alternatives

In the future, there will be other alternatives. Firefox 3.6 added -moz-image-rect to allow background images to be cropped. But this is not supported by other browsers and looks likely to be replaced by an alternative proposal (to use fragment identifiers) that is part of the CSS Image Values Module Level 3 specification. As far as I know, no stable release of any modern browser supports the use of fragment identifiers with bitmap images at the time of writing.

Emulating background-transform

Known support: Firefox 3.6+, Opera 10.5+, Safari 4+, Chrome 4+, IE 9+

Demo: Pseudo background-transform

Combining pseudo-elements and transforms makes it possible to emulate background transforms. A pseudo background-transform can be used to rotate, scale, and skew background images and sprites. There is no proposal for background-image transforms, so a pseudo-element hack is one way to emulate it.

Example: rotating a background image

The example of cropping sprites can be further developed by reducing the number of different images used in the sprite. Rather than applying transforms to images in a graphics package, they can be applied in the CSS.

The code to do this is relatively simple and might look something like:

.accordion a:before {
  content: "";
  float: left;
  width: 16px;
  height: 16px;
  margin: 0 5px 0 0;
  background: url(sprite.png) no-repeat 0 0;
}

.accordion.open a:before {
  transform: rotate(90deg);
}

To apply a transform to a more conventional background image (e.g., a large graphic sitting behind some content that doesn’t affect the positioning of other components) requires use of the positioning technique detailed in the article Multiple Backgrounds and Borders with CSS 2.1.

It involves setting the background image on a pseudo-element which is then positioned behind the content layer of an element using absolute positioning and z-index.

Example: mirroring a background image

There are instances when mirroring a background image might be desired. The approach is similar to that for rotating an image, but this time uses transform:scale().

Producing an exact mirror of an element or pseudo-element can be done using transform:scaleX(-1), transform:scaleY(-1), and transform:scale(-1,-1) to mirror along the x-axis, y-axis, and both axes, respectively.

The following code is an example of how a pseudo background-transform might be used for pagination links. A pseudo-element displays a single image (or region of a sprite) and is then mirrored. The image’s appearance is such that a rotation cannot produce the desired counterpart. Only a scale operation can do it.

.prev a:before,
.next a:before {
  content: "";
  float: left;
  width: 16px;
  height: 16px;
  margin: 0 5px 0 0;
  background: url(sprite.png) no-repeat 0 0;
}

.next a:before {
  float: right;
  margin: 0 0 0 5px;
  transform: scaleX(-1);
}

There is no support for this in IE 8. Even if you’re a fan of using IE filters to work around some missing CSS support, they won’t work on pseudo-elements.

Future alternatives

There don’t seem to be any future alternatives in any CSS working draft. For the moment, it looks like pseudo-element hacks will be needed to emulate effects like background transforms and background perspective without resorting to presentational HTML.

Emulating background-position

Known support: Firefox 3.5+, Opera 10+, Safari 4+, Chrome 4+, IE 8+

Demo: Pseudo background-position

The CSS 2.1 specification limits the values of background-position to offsets from the left and top sides. It’s possible to emulate positioning a background image from the right and bottom sides by applying the background image to a pseudo-element and using it as an additional background layer.

This hack is easily combined with the other hacks in this article. More details on the pseudo background-position hack can be found in the article on Multiple Backgrounds and Borders with CSS 2.1.

Example code

In this example, a pseudo-element is created and placed behind the element’s content layer. The background image is 500px × 300px and declared for the pseudo-element, which is also given dimensions that match those of the image. Since the pseudo-element is absolutely positioned, it can be positioned from the bottom and right of the element using offsets.

#content {
  position: relative;
  z-index: 1;
}

#content:before {
  content: "";
  position: absolute;
  z-index: -1;
  bottom: 10px;
  right: 10px;
  width: 500px;
  height: 300px;
  background: url(image.jpg);
}

Future alternatives

There is a part of the CSS Backgrounds and Borders module working draft that describes an improvement to the background-position property to allow positions to be set from any side. At the moment, Opera 11 is the only stable release of a browser that has implemented it.

Emulating background-opacity

Known support: Firefox 3.5+, Opera 10+, Safari 4+, Chrome 4+, IE 9+

Demo: Pseudo background-opacity

Changing the opacity of a pseudo-background is as simple as modifying the value of the opacity property. There is no IE 8 support for opacity and IE filters will not work on pseudo-elements.

Example code

This example code shows a pseudo-element being created and positioned behind the rest of the element’s content so as not to interfere with it. The pseudo-element is then sized to fit the element using offsets (but could be offset by other values or given an explicit size), given a background image, and has its opacity changed.

#content {
  position: relative;
  z-index: 1;
}

#content:before {
  content: "";
  position: absolute;
  z-index: -1;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: url(image.jpg);
  opacity: 0.7;
}

Notes

For now, and as far as I am aware, using CSS 2.1 pseudo-elements is the only widely supported (and backwards compatible) way to emulate background image crop, background transform, background opacity, and improved background positioning with semantic HTML.

Even when alternatives in CSS working drafts (e.g., the improved background-position and use of fragment identifiers) are widely implemented, pseudo-element background-image hacks will still have the advantage of letting you use other CSS properties like opacity, border-radius, border-image, box-shadow, transforms, etc., which may prove useful in certain situations. It can’t hurt to be aware of these options.

It’s worth mentioning that although you can only generate 2 pseudo-elements from a DOM element, in many cases you can easily use descendant elements to provide more pseudo-elements to play with. This idea was used to help create the rotated example on the CSS drop-shadows demo page and several of the CSS3 examples at the bottom of the pure CSS speech bubbles demo page.

Thanks to Mathias Bynens for reading and giving feedback on a draft of this article.

CSS is a versatile style language that is most frequently used to control the look and formatting of an HTML document based on information in the document tree. But there are some common publishing effects – such as formatting the first line of a paragraph – that would not be possible if you were only able to style elements based on this information. Fortunately, CSS has pseudo-elements and pseudo-classes.

As their names imply, they are not part of the DOM in the way that ‘real’ HTML elements and classes are. Instead, they are CSS abstractions that provide additional, and otherwise inaccessible, information about the document.

This article will discuss the CSS pseudo-elements that are part of CSS 2.1 – :first-letter, :first-line, :before, and :after – and how the :before and :after pseudo-elements can be exploited to create some interesting effects, without compromising the simplicity of your HTML. But first, let’s look at each type of pseudo-element and how to use them in their basic form.

The :first-line and :first-letter pseudo-elements

The :first-line pseudo-element lets you apply styles to the first formatted line of a block container element (i.e., elements with their display property set to block, inline-block, list-item, table-caption, or table-cell). For example:

p:first-line { font-weight: bold; }

…will change the first line of every paragraph to bold. The :first-line pseudo-element can be treated as if it were an extra HTML inline element wrapping only the first line of text in the paragraph.

The :first-letter pseudo-element lets you apply styles to the first letter (and any preceding punctuation) of the first formatted line of a block container element. No other inline content (e.g. an image) can appear before the text. For example:

p:first-letter { float: left; font-size: 200%; }

…will produce a basic ‘drop cap’ effect. The first letter of every paragraph will be floated left, and twice as large as the other letters in the paragraph. The :first-letter pseudo-element can be treated as if it were an extra HTML inline element wrapping only the first letter of text in the paragraph.

The :first-line and :first-letter pseudo-elements can only be attached to block container elements, but the first formatted line can be contained within any block-level descendant (e.g., elements with their display property set to block or list-item) in the same flow (i.e., not floated or positioned). For example, the following HTML fragment and CSS:

<div><p>An example of the first line of text being within a descendant element</p></div>

div:first-line { font-weight: bold; }

…would still result in a bold first line of text, because the paragraph’s text is the first formatted line of the div.

The :before and :after pseudo-elements

The :before and :after pseudo-elements are used to insert generated content before or after an element’s content. They can be treated as if they were extra HTML inline elements inserted just before and after the content of their associated element.

Generated content is specified using the content property which, in CSS 2.1, can only be used in conjunction with the :before and :after pseudo-elements. Furthermore, you must declare the content property in order to generate the :before and :after pseudo-elements.

The content property can take string, url(), attr(), counter() and counters() values. The url() value is used to insert an image. The attr() function returns as a string the value of the specified attribute for the associated element. The counter() and counters() functions can be used to display the value of any CSS counters.

For example, the following HTML fragment and CSS:

<a href="http://wikipedia.org">Wikipedia</a>

a:after { content: " (" attr(href) ")"; }

…would display the value of the href attribute after a link’s content, resulting in the following anchor text for the example above: Wikipedia (http://wikipedia.org). This can be a helpful way to display the destination of specific links in printed web documents.

Keep in mind that CSS is meant for adding presentation and not content. Therefore, the content property should be used with caution.

It’s also worth noting that the :first-letter and :first-line pseudo-elements apply to the first letter and first line of an element including any generated content inserted using the :before and :after pseudo-elements.

Browser support for pseudo-elements

The :first-letter and :first-line pseudo-elements were introduced in CSS1 and there is wide basic support for them. However, IE 6 and IE 7 have particularly buggy implementations; even modern browsers are not entirely consistent in the way that they handle the :first-line and :first-letter pseudo-elements (example bugs).

The :before and :after pseudo-elements were introduced in the CSS 2.1 specification and are fully implemented in Firefox 3.5+, IE 8+, Safari 3+, Google Chrome, and Opera. Modern versions of Firefox even support CSS transitions and animations applied to pseudo-elements. However, legacy browsers like IE 6 and IE 7 do not support the :before and :after pseudo-elements at all.

For more detailed information on pseudo-element browser support, browser bugs, and workarounds, have a look at Sitepoint’s reference and this article on IE 6/7 issues.

In most cases, the :before and :after pseudo-elements can be used as part of a ‘progressive enhancement’ approach to design and development, because IE 6 and IE 7 will simply ignore them altogether. Alternatively, Modernizr now includes a robust feature test for generated content, providing one way to specify fallbacks or enhancements depending on browser support. The important thing is to remember to check what happens in browsers where support is missing.

Alternative ways to use pseudo-elements

Let’s take a look at how the :before and :after pseudo-elements can be used as the basis for some interesting effects. Most of the time, this involves generating empty :before and :after pseudo-elements by declaring an empty string as the value of the content property. They can then be manipulated as if they were empty inline HTML elements, keeping your HTML clean and giving you full control of certain effects from within CSS style sheets.

Simple visual enhancements, like speech bubbles and folded corners, can even be created without the need for images. This relies on the fact that you can create simple shapes using CSS.

Several types of ‘CSS polygons’ can be created as a result of browsers rendering borders at an angle when they meet. This can be exploited to create triangles. For example, the following HTML fragment and CSS:

<div class="triangle"></div>

.triangle {
  width: 0;
  height: 0;
  border-width: 20px;
  border-style: solid;
  border-color: red transparent transparent;
}

…will create a downward pointing, red triangle. By varying the width, height, border-width, border-style, and border-color values you can produce different shapes and control their orientation and colour. For more information, be sure to read Jon Rogan’s summary of the technique.

The more advanced pseudo-element hacks use the extra background canvas afforded by each :before and :after pseudo-element. This can help you crop background images, control the opacity of background images, and ‘fake’ multiple backgrounds and borders in browsers without support for CSS3 multiple backgrounds (e.g., IE 8). Taken to ludicrous extremes, you can even build a whole CSS icon set. To start with, let’s look at some simple effects that can be created without images or presentational HTML.

Creating CSS speech bubbles

In this example, a quote is styled to look like a speech bubble, using CSS. This is done by creating a triangle using a pseudo-element, and then absolutely positioning it in the desired place. By adding position:relative to the CSS styles for the HTML element, you can absolutely position the :after pseudo-element relative to its associated element.

<div class="quote">[Quoted text]</div>

.quote {
  position: relative;
  width: 300px;
  padding: 15px 25px 20px;
  margin: 20px auto;
  font: italic 26px/1.4 Georgia, serif;
  color: #fff;
  background: #245991;
}

.quote:after {
  content: "";
  position: absolute;
  top: 100%;
  right: 25px;
  border-width: 30px 30px 0 0;
  border-style: solid;
  border-color: #245991 transparent;
}

There’s nothing stopping you from adding some CSS3 to further enhance the effect for capable browsers. This could be adding rounded corners to the box or applying a skew transform to the triangle itself. Fiddle with the code in this example.

Creating CSS ‘ribbons’

Using the same principle, you can create a CSS ribbon effect without images or extra HTML. This time the effect uses 2 pseudo-element triangles. The HTML fragment is still very simple.

<div class="container">
    <h1>Simple CSS ribbon</h1>
    <p>[other content]</p>
</div>

You then need to use negative margins to pull the h1 outwards so that it extends over the padding and beyond the boundaries of the container div. The HTML fragment above can be styled using the following CSS:

.container {
  width: 400px;
  padding: 20px;
  margin: 20px auto;
  background: #fff;
}

.container h1 {
  position: relative;
  padding: 10px 30px;
  margin: 0 -30px 20px;
  font-size: 20px;
  line-height: 24px;
  font-weight: bold;
  color: #fff;
  background: #87A800;
}

From here, you only need to add the pseudo-element triangles to create the ‘wrapping’ appearance associated with ribbons. The :before and :after pseudo-elements share many styles, so you can simplify the code by only overriding the styles that differ between the two. In this case, the triangle created with the :after pseudo-element must appear on the opposite side of the heading, and will be a mirror image of the other triangle. So you need to override the shared styles that control its position and orientation.

.container h1:before,
.container h1:after {
  content: "";
  position: absolute;
  top: 100%;
  left: 0;
  border-width: 0 10px 10px 0;
  border-style: solid;
  border-color: transparent #647D01;
}

/* override shared styles */
.container h1:after {
  left: auto;
  right: 0;
  border-width: 0 0 10px 10px;
}

Fiddle with the code in this example.

Creating CSS folded corners

The final example of this form of pseudo-element hack creates a simple CSS folded-corner effect. A pseudo-element’s border properties are set to produce two differently-coloured touching triangles. One triangle is a slightly darker or lighter shade of the box’s background colour. The other triangle matches the background colour of the box’s parent (e.g. white). The pseudo-element is then positioned in the top right corner of its associated element to complete the effect.

.note {
  position: relative;
  padding: 20px;
  margin: 2em 0;
  color: #fff;
  background: #97C02F;
}

.note:before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  border-width: 0 16px 16px 0;
  border-style: solid;
  border-color: #658E15 #fff;
}

Varying the size of the borders will vary the size and angle of the folded-corner. Fiddle with the code in this example.

Pseudo background-crop

Although creating polygons with pseudo-elements can produce some popular effects without images, the possibilities are inherently limited. But this is only one type of :before and :after pseudo-element hack. Treated as extra background canvases, they can be used to fill some gaps in existing browser support for CSS features.

One of those features is the cropping of background images. In the future, it’s likely that you’ll be able to crop background images using fragment identifiers, as is proposed in the CSS Image Values Module Level 3 draft. But at the moment no browsers support the use of fragment identifiers with bitmap images. Until they do, you can make use of this CSS 2.1 hack to emulate background image cropping in modern browsers.

The principle behind a ‘pseudo background-crop‘ is to apply a background-image to a pseudo-element rather than directly to an element in the HTML document. One of the applications of this technique is to crop icons that are part of a sprite.

For example, a web app might allow users to ‘save’, ‘edit’, or ‘delete’ an item. The HTML involved might look something like this:

<ul class="actions">
  <li class="save"><a href="#">Save</a></li>
  <li class="edit"><a href="#">Edit</a></li>
  <li class="delete"><a href="#">Delete</a></li>
</ul>

To enhance the appearance of these ‘action’ links, it is common to see icons sitting alongside the anchor text. For argument’s sake, let’s say that the relevant icons are part of a sprite that is organised using a 16px × 16px grid.

The :before pseudo-element – with dimensions that match the sprite’s grid unit – can be used to crop and display each icon. The sprite is referenced as a background image and the background-position property is used to control the precise positioning of each icon to be shown.

.actions a:before {
  content: "";
  float: left;
  width: 16px;
  height: 16px;
  margin: 0 5px 0 0;
  background: url(sprite.png);
}

.save a:before { background-position: 0 0; }
.edit a:before { background-position: -16px 0; }
.delete a:before { background-position: -32px 0; }

Using pseudo-elements like this helps to avoid the need to either add liberal amounts of white space to sprites or use empty HTML elements to do the cropping. Fiddle with the code in this example.

Pseudo background-position

The CSS 2.1 specification limits the values of background-position to horizontal and vertical offsets from the top-left corner of an element. The CSS Backgrounds and Borders Module Level 3 working draft includes an improvement to the background-position property to allow offsets to be set from any side. However, Opera 11+ is currently the only browser to have implemented it.

But by using pseudo-elements, it’s possible to emulate positioning a background image from any side in any browser with adequate CSS 2.1 support –’pseudo background-position‘.

Once a pseudo-element is created, it must be absolutely positioned in front of the associated element’s background but behind its content, so as not to prevent users from being able to select text or click on links. This is done by setting a positive z-index on the element and a negative z-index on the pseudo-element.

#content {
  position: relative;
  z-index: 1;
}

#content:before {
  content: "";
  position: absolute;
  z-index: -1;
}

Now the pseudo-element can be sized and positioned to sit over any area within (or beyond) the element itself, without affecting its content. This is achieved by using any combination of values for the top, right, bottom, and left positional offsets, as well as the width, and height properties. It is the key to their flexibility.

In this example, a 200px × 300px background image is applied to the pseudo-element, which is also given dimensions that match those of the image. Since the pseudo-element is absolutely positioned, it can be offset from the bottom and right of the associated HTML element.

#content {
  position: relative;
  z-index: 1;
}

#content:before {
  content: "";
  position: absolute;
  z-index: -1;
  bottom: 10px;
  right: 10px;
  width: 200px;
  height: 300px;
  background: url(image.jpg);
}

Many other hacks and effects are possible using the :before and :after pseudo-elements, especially when combined with CSS3. Hopefully this introduction to pseudo-elements, and how they can be exploited, will have inspired you to experiment with them in your work.

The future of pseudo-elements

The way that pseudo-elements are used will continue to change as CSS does. Some new applications will emerge, and existing ones will fade away as browser implementation of ‘CSS3 modules’ continues to improve.

Generated content and pseudo-elements themselves are likely to undergo changes too. The CSS3 Generated and Replaced Content Module introduced a two-colon format for pseudo-elements (i.e., ::before) to help distinguish between pseudo-classes and pseudo-elements. But for compatibility with previous levels of CSS, pseudo-elements do not require two colons. Most modern browsers support both formats, but it is not supported by IE 8 and the single-colon format ensures greater backwards compatibility.

The proposed extensions to pseudo-elements included the addition of nested pseudo-elements (::before::before), multiple pseudo-elements (::after(2)), wrapping pseudo-elements (::outside), and the ability to insert pseudo-elements into later parts of the document (::alternate). However, the CSS3 Generated and Replaced Content Module is undergoing significant changes.

This article was originally published in .net magazine in April 2011

Related resources

• Interactive examples of the code throughout this article
• CSS generated content techniques
• Automatic numbering with CSS counters
• CSS image replacement using pseudo-elements
• Multiple backgrounds and borders with CSS 2.1
• CSS background image hacks
• A whole bunch of amazing stuff pseudo-elements can do

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