For example, to include a PNG image in a document, authors may write: Here's a closeup of the Grand Canyon: This is a closeup of the Grand Canyon. Previous versions of HTML allowed authors to include images (via ) and applets (via ).

These elements have several limitations: • They fail to solve the more general problem of how to include new and future media types. • The element only works with Java-based applets.

This element is in favor of. • They pose accessibility problems. To address these issues, HTML 4 introduces the element, which offers an all-purpose solution to generic object inclusion.

The 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 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 Applet (.) Another HTML document The chart indicates that each type of inclusion has a specific and a general solution. The generic element will serve as the solution for implementing future media types., authors may use the element or the element., authors should use the element as the element is., authors may use either the new element or the 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 for a comparison of and for document inclusion. Images and other included objects may have hyperlinks associated with them, both through the standard, but also via. 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.

Attribute definitions = This attribute specifies the location of the image resource. Examples of widely recognized image formats include GIF, JPEG, and PNG. = This attribute specifies a link to a long description of the image.

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This description should supplement the short description provided using the attribute. When the image has an associated, this attribute should provide information about the image map's contents. This is particularly important for server-side image maps. Since an element may be within the content of an element, the user agent's mechanism in the user interface for accessing the 'longdesc' resource of the former must be different than the mechanism for accessing the resource of the latter.