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Thus, a link defined in the file "two.html" in the same directory as "one.html" would refer to the anchor as

follows:

...text before the link...

For more information, please consult <A href="./one.html#anchor-one"> anchor one</A>.

...text after the link...

The A element in the following example specifies a link (with href) and creates a named anchor (with

name) simultaneously:

I just returned from vacation! Here's a

<A name="anchor-two"

href="http://www.somecompany.com/People/Ian/vacation/family.png">

photo of my family at the lake.</A>.

This example contains a link to a different type of Web resource (a PNG image). Activating the link

should cause the image resource to be retrieved from the Web (and possibly displayed if the system has

been configured to do so).

Note. User agents should be able to find anchors created by empty

elements, but some fail to do so. For

example, some user agents may not find the "empty-anchor" in the following HTML fragment:

<A href="#empty-anchor">Link to empty anchor</A>

12.2.1 Syntax of anchor names

An anchor name is the value of either the name or id attribute when used in the context of anchors.

Anchor names must observe the following rules:

Uniqueness: Anchor names must be unique within a document. Anchor names that differ only in

case may not appear in the same document.

String matching: Comparisons between fragment identifiers [p.18] and anchor names must be done

by exact (case-sensitive) match.

Thus, the following example is correct with respect to string matching and must be considered a match by

user agents:

...more document...

ILLEGAL EXAMPLE:

The following example is illegal with respect to uniqueness since the two names are the same except for

case:

141

12.2.1 Syntax of anchor names

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Although the following excerpt is legal HTML, the behavior of the user agent is not defined; some user

agents may (incorrectly) consider this a match and others may not.

...more document...

Anchor names should be restricted to ASCII characters. Please consult the appendix for more information

about non-ASCII characters in URI attribute values [p.310] .

12.2.2 Nested links are illegal

Links and anchors defined by the A element must not be nested; an A element must not contain any other

A elements.

Since the DTD defines LINK element to be empty, LINK elements may not be nested either.

12.2.3 Anchors with the id attribute

The id attribute may be used to create an anchor at the start tag of any element (including the A element).

This example illustrates the use of the id attribute to position an anchor in an H2 element. The anchor is

linked to via the A element.

You may read more about this in <A href="#section2">Section Two</A>.

...later in the document

<H2 id="section2">Section Two</H2>

...later in the document

<P>Please refer to <A href="#section2">Section Two</A> above

for more details.

The following example names a destination anchor with the id attribute:

I just returned from vacation! Here's a

<A id="anchor-two">photo of my family at the lake.</A>.

The id and name attributes share the same name space. This means that they cannot both define an

anchor with the same name in the same document.

ILLEGAL EXAMPLE:

The following excerpt is illegal HTML since these attributes declare the same name twice in the same

document.

...

...pages and pages...

142

12.2.2 Nested links are illegal

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Because of its specification in the HTML DTD, the name attribute may contain character references

[p.40] . Thus, the value Dürst is a valid name attribute value, as is Dürst . The id

attribute, on the other hand, may not contain character references.

Use

name

? Authors should consider the following issues when deciding whether to use

name

for an anchor name:

The

attribute can act as more than just an anchor name (e.g., style sheet selector, processing

identifier, etc.).

Some older user agents don't support anchors created with the

attribute.

The

name

attribute allows richer anchors names (with entities [p.40] ).

12.2.4 Unavailable and unidentifiable resources

A reference to an unavailable or unidentifiable resource is an error. Although user agents may vary in how

they handle such an error, we recommend the following behavior:

If a user agent cannot locate a linked resource, it should alert the user.

If a user agent cannot identify the type of a linked resource, it should still attempt to process it. It

should alert the user and may allow the user to intervene and identify the document type.

12.3 Document relationships: the LINK element

<!ELEMENT LINK - O EMPTY -- a media-independent link -->

<!ATTLIST LINK

%attrs; -- %coreattrs, %i18n, %events --

charset %Charset; #IMPLIED -- char encoding of linked resource --

href %URI; #IMPLIED -- URI for linked resource --

hreflang %LanguageCode; #IMPLIED -- language code --

type %ContentType; #IMPLIED -- advisory content type --

rel %LinkTypes; #IMPLIED -- forward link types --

rev %LinkTypes; #IMPLIED -- reverse link types --

media %MediaDesc; #IMPLIED -- for rendering on these media --

Start tag: required, End tag: forbidden

Attributes defined elsewhere

id, class (document-wide identifiers [p.65] )

lang (language information [p.71] ), dir (text direction [p.73] )

title (element title [p.57] )

style (inline style information [p.174] )

onclick, ondblclick, onmousedown, onmouseup, onmouseover, onmousemove,

onmouseout, onkeypress, onkeydown, onkeyup (intrinsic events [p.240] )

href, hreflang, type, rel, rev (links and anchors [p.135] )

target (target frame information [p.200] )

media (header style information [p.174] )

143

12.3 Document relationships: the LINK element

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charset(character encodings [p.37] )

This element defines a link. Unlike A, it may only appear in the HEAD section of a document, although it

may appear any number of times. Although LINK has no content, it conveys relationship information that

may be rendered by user agents in a variety of ways (e.g., a tool-bar with a drop-down menu of links).

This example illustrates how several LINK definitions may appear in the HEAD section of a document.

The current document is "Chapter2.html". The rel attribute specifies the relationship of the linked

document with the current document. The values "Index", "Next", and "Prev" are explained in the section

on link types [p.48] .

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"

"http://www.w3.org/TR/REC-html40/strict.dtd">

<HTML>

<HEAD>

<TITLE>Chapter 2</TITLE>

</HEAD>

...the rest of the document...

12.3.1 Forward and reverse links

The rel and rev attributes play complementary roles -- the rel attribute specifies a forward link and

the rev attribute specifies a reverse link.

Consider two documents A and B.

Document A: <LINK href="docB" rel="foo">

Has exactly the same meaning as:

Document B: <LINK href="docA" rev="foo">

Both attributes may be specified simultaneously.

12.3.2 Links and external style sheets

When the LINK element links an external style sheet to a document, the type attribute specifies the style

sheet language and the media attribute specifies the intended rendering medium or media. User agents

may save time by retrieving from the network only those style sheets that apply to the current device.

Media types [p.177] are further discussed in the section on style sheets.

144

12.3.1 Forward and reverse links

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12.3.3 Links and search engines

Authors may use the LINK element to provide a variety of information to search engines, including:

Links to alternate versions of a document, written in another human language.

Links to alternate versions of a document, designed for different media, for instance a version

especially suited for printing.

Links to the starting page of a collection of documents.

The examples below illustrate how language information, media types, and link types may be combined to

improve document handling by search engines.

In the following example, we use the hreflang attribute to tell search engines where to find Dutch,

Portuguese, and Arabic versions of a document. Note the use of the dir and charset attributes for the

Arabic manual, and the use of the lang attribute to indicate that the value of the title attribute for the

LINK element designating the French manual is in French.

<HEAD>

<TITLE>The manual in English</TITLE>

<LINK title="The manual in Dutch"

type="text/html"

rel="alternate"

hreflang="nl"

href="http://someplace.com/manual/dutch.html">

<LINK title="The manual in Portuguese"

type="text/html"

rel="alternate"

hreflang="pt"

href="http://someplace.com/manual/portuguese.html">

<LINK title="The manual in Arabic"

dir="rtl"

type="text/html"

rel="alternate"

charset="ISO-8859-6"

hreflang="ar"

href="http://someplace.com/manual/arabic.html">

<LINK lang="fr" title="La documentation en Français"

type="text/html"

rel="alternate"

hreflang="fr"

href="http://someplace.com/manual/french.html">

</HEAD>

In the following example, we tell search engines where to find the printed version of a manual.

<HEAD>

<TITLE>Reference manual</TITLE>

<LINK media="print" title="The manual in postscript"

type="application/postscript"

rel="alternate"

href="http://someplace.com/manual/postscript.ps">

</HEAD>

145

12.3.3 Links and search engines

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In the following example, we tell search engines where to find the front page of a collection of documents.

<HEAD>

<TITLE>Reference manual -- Page 5</TITLE>

<LINK rel="Start" title="The first page of the manual"

type="text/html"

href="http://someplace.com/manual/start.html">

</HEAD>

Further information is given in the notes in the appendix on helping search engines index your Web site

[p.315] .

12.4 Path information: the BASE element

<!ELEMENT BASE - O EMPTY -- document base URI -->

<!ATTLIST BASE

href %URI; #REQUIRED -- URI that acts as base URI --

Start tag: required, End tag: forbidden

Attribute definitions

href = uri [p.44] [CT] [p.43]

This attribute specifies an absolute URI that acts as the base URI for resolving relative URIs.

Attributes defined elsewhere

target (target frame information [p.200] )

In HTML, links and references to external images, applets, form-processing programs, style sheets, etc.

are always specified by a URI. Relative URIs are resolved [p.147] according to a base URI, which may

come from a variety of sources. The BASE element allows authors to specify a document's base URI

explicitly.

When present, the BASE element must appear in the HEAD section of an HTML document, before any

element that refers to an external source. The path information specified by the BASE element only affects

URIs in the document where the element appears.

For example, given the following BASE declaration and A declaration:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"

"http://www.w3.org/TR/REC-html40/strict.dtd">

<HTML>

<HEAD>

<TITLE>Our Products</TITLE>

</HEAD>

146

12.4 Path information: the BASE element

<BODY>

<P>Have you seen our <A href="../cages/birds.gif">Bird Cages</A>?

</BODY>

</HTML>

the relative URI "../cages/birds.gif" would resolve to:

http://www.aviary.com/cages/birds.gif

12.4.1 Resolving relative URIs

User agents must calculate the base URI for resolving relative URIs according to [RFC1808] [p.328] ,

section 3. The following describes how [RFC1808] [p.328] applies specifically to HTML.

User agents must calculate the base URI according to the following precedences (highest priority to

lowest):

1. The base URI is set by the BASE element.

2. The base URI is given by meta data discovered during a protocol interaction, such as an HTTP

header (see [RFC2068] [p.328] ).

3. By default, the base URI is that of the current document. Not all HTML documents have a base URI

(e.g., a valid HTML document may appear in an email and may not be designated by a URI). Such

HTML documents are considered erroneous if they contain relative URIs and rely on a default base

URI.

Additionally, the OBJECT and APPLET elements define attributes that take precedence over the value set

by the BASE element. Please consult the definitions of these elements for more information about URI

issues specific to them.

Link elements specified by HTTP headers are handled exactly as LINK elements that appear explicitly in

a document.

147

12.4.1 Resolving relative URIs

148

12.4.1 Resolving relative URIs

13 Objects, Images, and Applets

Contents

149

1. Introduction to objects, images, and applets

150

2. Including an image: the IMG element

152

3. Generic inclusion: the OBJECT element

154

1. Rules for rendering objects

156

2. Object initialization: the PARAM element

158

3. Global naming schemes for objects

158

4. Object declarations and instantiations

160

4. Including an applet: the APPLET element

162

5. Notes on embedded documents

162

6. Image maps

163

1. Client-side image maps: the MAP and AREA elements

165

Client-side image map examples

167

2. Server-side image maps

168

7. Visual presentation of images, objects, and applets

168

1. Width and height

168

2. White space around images and objects

168

3. Borders

169

4. Alignment

169

8. How to specify alternate text

13.1 Introduction to objects, images, and applets

HTML's multimedia features allow authors to include images, applets (programs that are automatically

downloaded and run on the user's machine), video clips, and other HTML documents in their pages.

For example, to include a PNG image in a document, authors may write:

<BODY>

<P>Here's a closeup of the Grand Canyon:

This is a <EM>closeup</EM> of the Grand Canyon.

</OBJECT>

</BODY>

Previous versions of HTML allowed authors to include images (via IMG) and applets (via APPLET).

These elements have several limitations:

They fail to solve the more general problem of how to include new and future media types.

The APPLET element only works with Java-based applets. This element is deprecated [p.34] in favor

of OBJECT.

They pose accessibility problems.

149

13 Objects, Images, and Applets

To address these issues, HTML 4.0 introduces the OBJECT element, which offers an all-purpose solution

to generic object inclusion. The OBJECT element allows HTML authors to specify everything required by

an object for its presentation by a user agent: source code, initial values, and run-time data. In this

specification, the term "object" is used to describe the things that people want to place in HTML

documents; other commonly used terms for these things are: applets, plug-ins, media handlers, etc.

The new OBJECT element thus subsumes some of the tasks carried out by existing elements. Consider the

following chart of functionalities:

Type of inclusion

Specific element

Generic element

Image

IMG

OBJECT

Applet

APPLET (Deprecated [p.34] .) OBJECT

Another HTML document IFRAME

OBJECT

The chart indicates that each type of inclusion has a specific and a general solution. The generic OBJECT

element will serve as the solution for implementing future media types.

To include images, authors may use the OBJECT element or the IMG element.

To include applets, authors should use the OBJECT element as the APPLET element is deprecated [p.34] .

To include one HTML document in another, authors may use either the new IFRAME element or the

OBJECT element. In both cases, the embedded document remains independent of the main document.

Visual user agents may present the embedded document in a distinct window within the main document.

Please consult the notes on embedded documents [p.162] for a comparison of OBJECT and IFRAME for

document inclusion.

Images and other included objects may have hyperlinks associated with them, both through the standard

linking mechanisms [p.135] , but also via image maps [p.162] . An image map specifies active geometric

regions of an included object and assigns a link to each region. When activated, these links may cause a

document to be retrieved, may run a program on the server, etc.

In the following sections, we discuss the various mechanisms available to authors for multimedia

inclusions and creating image maps for those inclusions.

13.2 Including an image: the IMG element

<!-- To avoid problems with text-only UAs as well as

to make image content understandable and navigable

to users of non-visual UAs, you need to provide

a description with ALT, and avoid server-side image maps -->

<!ELEMENT IMG - O EMPTY -- Embedded image -->

<!ATTLIST IMG

%attrs; -- %coreattrs, %i18n, %events --

src %URI; #REQUIRED -- URI of image to embed --

alt %Text; #REQUIRED -- short description --

longdesc %URI; #IMPLIED -- link to long description

150

13.2 Including an image: the IMG element

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