Linking Style Sheets to HTML

There are many ways to link style sheets to HTML, each carrying its own advantages and disadvantages. New HTML elements and attributes have been introduced to allow easy incorporation of style sheets into HTML documents.

Linking to an External Style Sheet

An external style sheet may be linked to an HTML document through HTML's LINK element:

The <LINK> tag is placed in the document HEAD. The optional TYPE attribute is used to specify a media type--text/css for a Cascading Style Sheet--allowing browsers to ignore style sheet types that they do not support. Configuring the server to send text/css as the Content-type for CSS files is also a good idea.

External style sheets should not contain any HTML tags like <HEAD> or <STYLE>. The style sheet should consist merely of style rules or statements. A file consisting solely of

P { margin: 2em }

could be used as an external style sheet.

The <LINK> tag also takes an optional MEDIA attribute, which specifies the medium or media to which the style sheet should be applied. Possible values are

Multiple media are specified through a comma-separated list or the value all.

Netscape Navigator 4.x incorrectly ignores any linked or embedded style sheets declared with MEDIA values other than screen. For example, MEDIA="screen, projection" will cause the style sheet to be ignored by Navigator 4.x, even if the presentation device is a computer screen. Navigator 4.x also ignores style sheets declared with MEDIA=all.

The REL attribute is used to define the relationship between the linked file and the HTML document. REL=StyleSheet specifies a persistent or preferred style while REL="Alternate StyleSheet" defines an alternate style. A persistent style is one that is always applied when style sheets are enabled. The absence of the TITLE attribute, as in the first <LINK> tag in the example, defines a persistent style.

A preferred style is one that is automatically applied, such as in the second <LINK> tag in the example. The combination of REL=StyleSheet and a TITLE attribute specifies a preferred style. Authors cannot specify more than one preferred style.

An alternate style is indicated by REL="Alternate StyleSheet". The third <LINK> tag in the example defines an alternate style, which the user could choose to replace the preferred style sheet.

Note that current browsers generally lack the ability to choose alternate styles.

<LINK REL=StyleSheet HREF="basics.css" TITLE="Contemporary">

<LINK REL=StyleSheet HREF="tables.css" TITLE="Contemporary">

<LINK REL=StyleSheet HREF="forms.css" TITLE="Contemporary">

In this example, three style sheets are combined into one "Contemporary" style that is applied as a preferred style sheet. To combine multiple style sheets into a single style, one must use the same TITLE with each style sheet.

An external style sheet is ideal when the style is applied to numerous pages. With an external style sheet, an author could change the look of an entire site by simply changing one file. As well, most browsers will cache an external style sheet, thus avoiding a delay in page presentation once the style sheet is cached.

Microsoft Internet Explorer�3 for Windows�95/NT4 does not support BODY background images or colors from linked style sheets. Given this bug, authors may wish to provide another mechanism for including a background image or color, such as embedding or inlining the style, or by using the BACKGROUND attribute of the BODY element.

Embedding a Style Sheet

The STYLE element is placed in the document HEAD. The required TYPE attribute is used to specify a media type, as is its function with the LINK element. Similarly, the TITLE and MEDIA attributes may also be specified with STYLE.

Very old browsers such as Netscape 2.0, unaware of the STYLE element, would normally show its contents as if they were part of the BODY, thus making the style sheet visible to the user. To prevent this, the contents of the STYLE element may be contained within an SGML comment (), as in the preceding example. This use of comment tokens to hide the style sheet from old browsers should only be used in HTML, where the comment tokens are actually part of the style sheet. In XHTML, the comment tokens would be a real XML comment, and the style sheet would be hidden from browsers that treat the document as XML.

An embedded style sheet should be used when a single document has a unique style. If the same style sheet is used in multiple documents, then an external style sheet would be more appropriate.

Importing a Style Sheet

A style sheet may be imported with CSS's @import statement. This statement may be used in a CSS file or inside the STYLE element:

Note that other CSS rules may still be included in the STYLE element, but that all @import statements must occur at the start of the style sheet. Any rules specified in the style sheet itself override conflicting rules in the imported style sheets. For example, even if one of the imported style sheets contained DT {background: aqua}, definition terms would still have a yellow background.

The order in which the style sheets are imported is important in determining how they cascade. In the above example, if the style.css imported style sheet specified that STRONG elements be shown in red and the punk.css style sheet specified that STRONG elements be shown in yellow, then the latter rule would win out, and STRONG elements would be in yellow.

Imported style sheets are useful for purposes of modularity. For example, a site may separate different style sheets by the selectors used. There may be a simple.css style sheet that gives rules for common elements such as BODY, P, H1, and H2. In addition, there may be an extra.css style sheet that gives rules for less common elements such as CODE, BLOCKQUOTE, and DFN. A tables.css style sheet may be used to define rules for table elements. These three style sheets could be included in HTML documents, as needed, with the @import statement. The three style sheets could also be combined via the LINK element.

Inlining Style

Style may be inlined using the STYLE attribute. The STYLE attribute may be applied to any BODY element (including BODY itself) except for BASEFONT, PARAM, and SCRIPT. The attribute takes as its value any number of CSS declarations, where each declaration is separated by a semicolon. An example follows:

<P STYLE="color: red; font-family: 'New Century Schoolbook', serif

">
This paragraph is styled in red with the New Century Schoolbook font,
if available.</P>

Note that New Century Schoolbook is contained within single quotes in the STYLE attribute since double quotes are used to contain the style declarations.

Inlining style is far more inflexible than the other methods. To use inline style, one must declare a single style sheet language for the entire document using the Content-Style-Type HTTP header extension. With inlined CSS, an author must send text/css as the Content-Style-Type HTTP header or include the following tag in the HEAD:

Inlining style loses many of the advantages of style sheets by mixing content with presentation. As well, inlined styles implicitly apply to all media, since there is no mechanism for specifying the intended medium for an inlined style. This method should be used sparingly, such as when a style is to be applied on all media to a single occurrence of an element. If the style should be applied to a single element instance but only with certain media, use the ID attribute instead of the STYLE attribute.

The CLASS Attribute

The CLASS attribute is used to specify the style class to which the element belongs. For example, the style sheet may have created the punk and warning classes:

<H1 CLASS=punk>Proprietary Extensions</H1>

<P CLASS=warning>Many proprietary extensions can have negative
side-effects, both on supporting and non-supporting browsers...

In this example, the punk class may be applied to any BODY element since it does not have an HTML element associated with it in the style sheet. Using the example's style sheet, the warning class may only be applied to the P element.

A good practice is to name classes according to their function rather than their appearance. The warning class in the previous example could have been named red, but this name would become meaningless if the author decided to change the style of the class to a different color, or if the author wished to define an aural style for those using speech synthesizers.

Classes can be a very effective method of applying different styles to structurally identical sections of an HTML document. For example, this page uses classes to give a different style to CSS code and HTML code.

The ID Attribute

The ID attribute is used to define a unique style for an element. A CSS rule such as

Each ID attribute must have a unique value over the document. The value must be an initial letter followed by letters, digits, or hyphens. The letters are restricted to A-Z and a-z.

Note that HTML 4 allows periods in ID attribute values, but CSS1 does not allow periods in ID selectors. Also note that CSS1 allows the Unicode characters 161-255 as well as escaped Unicode characters as a numeric code, but HTML 4 does not allow these characters in an ID attribute value.

The use of ID is appropriate when a style only needs to be applied once in any document. ID contrasts with the STYLE attribute in that the former allows medium-specific styles and can also be applied to multiple documents (though only once in each document).

The SPAN Element

The SPAN element was introduced into HTML to allow authors to give style that could not be attached to a structural HTML element. SPAN may be used as a selector in a style sheet, and it also accepts the STYLE, CLASS, and ID attributes.

SPAN is an inline element, so it may be used just as elements such as EM and STRONG in HTML. The important distinction is that while EM and STRONG carry structural meaning, SPAN has no such meaning. It exists purely to apply style, and so has no effect when the style sheet is disabled.

The DIV Element

The DIV element is similar to the SPAN element in function, with the main difference being that DIV (short for "division") is a block-level element. DIV may contain paragraphs, headings, tables, and even other divisions. This makes DIV ideal for marking different classes of containers, such as a chapter, abstract, or note. For example:

<DIV CLASS=note>

<H1>Divisions</H1>

<P>The DIV element is defined in HTML 3.2, but only the ALIGN
attribute is permitted in HTML 3.2. HTML 4.0 adds the CLASS, STYLE,
and ID attributes, among others.</P>

<P>Since DIV may contain other block-level containers, it is useful
for marking large sections of a document, such as this note.</P>

<P>The closing tag is required.</P>

</DIV>

A Note about Validation

Few CSS-styled documents will validate at the HTML�3.2 (Wilbur) level. HTML�3.2 does not define the SPAN element, nor the CLASS, STYLE, or ID attributes, and also lacks support for the TYPE and MEDIA attributes on the LINK and STYLE elements.

These style-related elements and attributes are not harmful to non-supporting browsers, as they are safely ignored. Documents using these elements and attributes may be validated against HTML 4.