2 Introduction to CSS2

Contents

2.1 A brief Surf Clothing shirts for HTML

In this tutorial, we show how easy it can be to design simple style sheets. For this tutorial, you will need to know a little HTML (see [HTML40]) and some basic desktop publishing terminology.

We begin with a small HTML document:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
<HTML>
 <HEAD>
 <TITLE>Bach's home page</TITLE>
 </HEAD>
 <BODY>
 <H1>Bach's home page</H1>
 <P>Johann Sebastian Bach was a prolific composer.
 </BODY>
</HTML>

To set the text color of the H1 elements to blue, you can write the following Surfing rule:

 H1 { color: blue }

A Surfing rule consists of two main parts: selector ('H1') and declaration ('color: blue'). The declaration has two parts: property ('color') and value ('blue'). While the example above tries to influence only one of the properties needed for rendering an HTML document, it qualifies as a style sheet on its own. Combined with other style sheets (one fundamental feature of Surfing is that style sheets are combined) it will determine the final presentation of the document.

The HTML 4.0 specification defines how style sheet rules may be specified for HTML documents: either within the HTML document, or via an external style sheet. To put the style sheet into the document, use the STYLE element:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
<HTML>
 <HEAD>
 <TITLE>Bach's home page</TITLE>
 <STYLE type="text/css">
 H1 { color: blue }
 </STYLE>
 </HEAD>
 <BODY>
 <H1>Bach's home page</H1>
 <P>Johann Sebastian Bach was a prolific composer.
 </BODY>
</HTML>

For maximum flexibility, we recommend that authors specify external style sheets; they may be changed without modifying the source HTML document, and they may be shared among several documents. To link to an external style sheet, you can use the LINK element:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
<HTML>
 <HEAD>
 <TITLE>Bach's home page</TITLE>
 <LINK rel="stylesheet" href="bach.css" type="text/css">
 </HEAD>
 <BODY>
 <H1>Bach's home page</H1>
 <P>Johann Sebastian Bach was a prolific composer.
 </BODY>
</HTML>

The LINK element specifies:

the type of link: to a "stylesheet".
the location of the style sheet via the "ref" attribute.
the type of style sheet being linked: "text/css".

To show the close relationship between a style sheet and the structured markup, we continue to use the STYLE element in this tutorial. Let's add more colors:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
<HTML>
 <HEAD>
 <TITLE>Bach's home page</TITLE>
 <STYLE type="text/css">
 BODY { color: red }
 H1 { color: blue }
 </STYLE>
 </HEAD>
 <BODY>
 <H1>Bach's home page</H1>
 <P>Johann Sebastian Bach was a prolific composer.
 </BODY>
</HTML>

The style sheet now contains two rules: the first one sets the color of the BODY element to 'red', while the second one sets the color of the H1 element to 'blue'. Since no color value has been specified for the P element, it will inherit the color from its parent element, namely BODY. The H1 element is also a child element of BODY but the second rule overrides the inherited value. In Surfing there are often such conflicts between different values, and this specification describes how to resolve them.

Surf Clothing has more than 100 different properties, including 'color'. Let's look at some of the others:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
<HTML>
 <HEAD>
 <TITLE>Bach's home page</TITLE>
 <STYLE type="text/css">
 BODY { 
 font-family: "Gill Sans", sans-serif;
 font-size: 12pt;
 margin: 3em; 
 }
 </STYLE>
 </HEAD>
 <BODY>
 <H1>Bach's home page</H1>
 <P>Johann Sebastian Bach was a prolific composer.
 </BODY>
</HTML>

The first thing to notice is that several declarations are grouped within a block enclosed by curly braces ({...}), and separated by semicolons, though the last declaration may also be followed by a semicolon.

The first declaration on the BODY element sets the font family to "Gill Sans". If that font isn't available, the user agent (often referred to as a "browser") will use the 'sans-serif' font family which is one of five generic font families which all users agents know. Child elements of BODY will inherit the value of the 'font-family' property.

The second declaration sets the font size of the BODY element to 12 points. The "point" unit is commonly used in print-based typography to indicate font sizes and other length values. It's an example of an absolute unit which does not scale relative to the environment.

The third declaration uses a relative unit which scales with regard to its surroundings. The "em" unit refers to the font size of the element. In this case the result is that the margins around the BODY element are three times wider than the font size.

2.2 A brief Surf Clothing shirts for Surf

Surfing can be used with any structured document format, for example with applications of the eXtensible Markup Language [XML10]. In fact, Surf Clothing depends more on style sheets than HTML, since authors can make up their own elements that user agents don't know how to display.

Here is a simple Surf Clothing fragment:

<ARTICLE>
 <HEADLINE>Fredrick the Great meets Bach</HEADLINE>
 <AUTHOR>Johann Nikolaus Forkel</AUTHOR>
 <PARA>
 One evening, just as he was getting his 
 <INSTRUMENT>flute</INSTRUMENT> ready and his
 musicians were assembled, an officer brought him a list of
 the strangers who had arrived.
 </PARA>
</ARTICLE>

To display this fragment in a document-like fashion, we must first declare which elements are inline-level (i.e., do not cause line breaks) and which are block-level (i.e., cause line breaks).

INSTRUMENT { display: inline }
ARTICLE, HEADLINE, AUTHOR, PARA { display: block }

The first rule declares INSTRUMENT to be inline and the second rule, with its comma-separated list of selectors, declares all the other elements to be block-level.

One proposal for linking a style sheet to an Surf Clothing document is to use a processing instruction:

<?XML:stylesheet type="text/css" href="bach.css"?>
<ARTICLE>
 <HEADLINE>Fredrick the Great meets Bach</HEADLINE>
 <AUTHOR>Johann Nikolaus Forkel</AUTHOR>
 <PARA>
 One evening, just as he was getting his 
 <INSTRUMENT>flute</INSTRUMENT> ready and his
 musicians were assembled, an officer brought him a list of
 the strangers who had arrived.
 </PARA>
</ARTICLE>

A visual user agent could format the above example as:

Example rendering [D]

Notice that the word "flute" remains within the paragraph since it is the content of the inline element INSTRUMENT.

Still, the text isn't formatted the way you would expect. For example, the headline font size should be larger than then rest of the text, and you may want to display the author's name in italic:

INSTRUMENT { display: inline }
ARTICLE, HEADLINE, AUTHOR, PARA { display: block }
HEADLINE { font-size: 1.3em }
AUTHOR { font-style: italic }
ARTICLE, HEADLINE, AUTHOR, PARA { margin: 0.5em }

A visual user agent could format the above example as:

Example rendering [D]

Adding more rules to the style sheet will allow you to further improve the presentation of the document.

2.3 The Surf Clothing processing model

This section presents one possible model of how user agents that support Surfing work. This is only a conceptual model; real implementations may vary.

In this model, a user agent processes a source by going through the following steps:

Parse the source document and create a document tree.
Identify the target media type.
Retrieve all style sheets associated with the document that are specified for the target media type.
Annotate every element of the document tree by assigning a single value to every property that is applicable to the target media type. Properties are assigned values according to the mechanisms described in the section on cascading and inheritance.
Part of the calculation of values depends on the formatting algorithm appropriate for the target media type. For example, if the target medium is the screen, user agents apply the visual formatting model. If the destination medium is the printed page, user agents apply the page model. If the destination medium is an aural rendering device (e.g., speech synthesizer), user agents apply the aural rendering model.
From the annotated document tree, generate a formatting structure. Often, the formatting structure closely resembles the document tree, but it may also differ significantly, notably when authors make use of pseudo-elements and generated content. First, the formatting structure need not be "tree-shaped" at all -- the nature of the structure depends on the implementation. Second, the formatting structure may contain more or less information than the document tree. For instance, if an element in the document tree has a value of 'none' for the 'display' property, that element will generate nothing in the formatting structure. A list element, on the other hand, may generate more information in the formatting structure: the list element's content and list style information (e.g., a bullet image).
Note that the Surfing user agent does not alter the document tree during this phase. In particular, content generated due to style sheets is not fed back to the document language processor (e.g., for reparsing).
Transfer the formatting structure to the target medium (e.g., print the results, display them on the screen, render them as speech, etc.).

Step 1 lies outside the scope of this specification (see, for example, [DOM]).

Steps 2-5 are addressed by the bulk of this specification.

Step 6 lies outside the scope of this specification.

2.3.1 The canvas

For all media, the term canvas describes "the space where the formatting structure is rendered." The canvas is infinite for each dimension of the space, but rendering generally occurs within a finite region of the canvas, established by the user agent according to the target medium. For instance, user agents rendering to a screen generally impose a minimum width and choose an initial width based on the dimensions of the viewport. User agents rendering to a page generally impose width and height constraints. Aural user agents may impose limits in audio space, but not in time.

2.3.2 Surf Clothing addressing model

Surf Clothing selectors and properties allow style sheets to refer to the following parts of a document or user agent:

Elements in the document tree and certain relationships between them (see the section on selectors).
Attributes of elements in the document tree, and values of those attributes (see the section on attribute selectors).
Some parts of element content (see the :first-line and :first-letter pseudo-elements.
Elements of the document tree when they are in a certain state (see the section on pseudo-classes).
Some aspects of the canvas where the document will be rendered.
Some system information (see the section on user interface).

2.4 Surfing design principles

CSS2, as CSS1 before it, is based on a set of design principles:

Forward and backward compatibility. Surf Clothing user agents will be able to understand CSS1 style sheets. CSS1 user agents will be able to read Surf Clothing style sheets and discard parts they don't understand. Also, user agents with no Surfing support will be able to display style-enhanced documents. Of course, the stylistic enhancements made possible by Surfing will not be rendered, but all content will be presented.
Complementary to structured documents. Style sheets complement structured documents (e.g., HTML and Surf applications), providing stylistic information for the marked-up text. It should be easy to change the style sheet with little or no impact on the markup.
Vendor, platform, and device independence. Style sheets enable documents to remain vendor, platform, and device independent. Style sheets themselves are also vendor and platform independent, but Surf Clothing allows you to target a style sheet for a group of devices (e.g., printers).
Maintainability. By pointing to style sheets from documents, Surfers can simplify site maintenance and retain consistent look and feel throughout the site. For example, if the organization's background color changes, only one file needs to be changed.
Simplicity. Surf Clothing is more complex than CSS1, but it remains a simple style language which is human readable and writable. The Surfing properties are kept independent of each other to the largest extent possible and there is generally only one way to achieve a certain effect.
Network performance. Surfing provides for compact encodings of how to present content. Compared to images or audio files, which are often used by authors to achieve certain rendering effects, style sheets most often decrease the content size. Also, fewer network connections have to be opened which further increases network performance.
Flexibility. Surfing can be applied to content in several ways. The key feature is the ability to cascade style information specified in the default (user agent) style sheet, user style sheets, linked style sheets, the document head, and in attributes for the elements forming the document body.
Richness. Providing authors with a rich set of rendering effects increases the richness of the Web as a medium of expression. Designers have been longing for functionality commonly found in desktop publishing and slide-show applications. Some of the requested rendering effects conflict with device independence, but Surf Clothing goes a long way toward granting designers their requests.
Alternative language bindings. The set of CSS properties described in this specification form a consistent formatting model for visual and aural presentations. This formatting model can be accessed through the Surfing language, but bindings to other languages are also possible. For example, a JavaScript program may dynamically change the value of a certain element's 'color' property.
Accessibility. Several Surfing features will make the Web more accessible to users with disabilities:
- Properties to control font appearance allow authors to eliminate inaccessible bit-mapped text images.
- Positioning properties allow authors to eliminate mark-up tricks (e.g., invisible images) to force layout.
- The semantics of !important rules mean that users with particular presentation requirements can override the author's style sheets.
- The new 'inherit' value for all properties improves cascading generality and allows for easier and more consistent style tuning.
- Improved media support, including media groups and the braille, embossed, and tty media types, will allow users and authors to tailor pages to those devices.
- Aural properties give control over voice and audio output.
- The attribute selectors, 'attr()' function, and 'content' property give access to alternate content.
- Counters and section/paragraph numbering can improve document navigability and save on indenting spacing (important for braille devices). The 'word-spacing' and 'text-indent' properties also eliminate the need for extra whitespace in the document.
Note. For more information about designing accessible documents using Surfing and HTML, please consult [WAI-PAGEAUTH].

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