By Chuck Musciano
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11. Frames Anyone who has had more than one application window open on her graphical desktop at a time can immediately appreciate the benefits of frames. Frames let you divide the browser window into multiple display areas, each containing a different document. Figure 2-6 is an example of a frame display. It shows how the document window may be divided into independent windows separated by rule lines and scroll bars. What is not immediately apparent in the example, though, is that each frame displays an independent document, and not necessarily HTML or XHTML ones, either.
We also should mention the alt attribute. Give it some text value that explains the image display for those who have disabled image display, or for browsers that may be able to read to the disabled user. 2. Image Maps Image maps are images within an anchor with a special attribute: they may contain more than one hyperlink. One way to enable an image map is by adding the ismap attribute to an tag placed inside an anchor tag (). When the user clicks somewhere in the image, the graphical browser sends the relative X,Y coordinates of the mouse position to the server that is also designated in the anchor.
And, to make life a bit easier for HTML authors, the browser software often infers an end tag from surrounding and obvious context, so you needn't explicitly include some end tags in your source HTML document. ) Our simple example is missing an end tag that is so commonly inferred and hence not included in the source that some veteran HTML authors don't even know that it exists. Which one? The XHTML standard is much more rigid, insisting that all tags have corresponding end tags. 4. HTML Skeleton Notice, too, that our simple example HTML document starts and ends with and tags.