Web site design - 31 CHAPTER Positioned Objects …. This is an
Thursday, January 31st, 200831 CHAPTER Positioned Objects …. This is an oddball chapter within the scheme of Part III. Thus far, I have devoted each chapter to a distinct set of object model objects. This chapter breaks away from that mold for just a moment. The main reason that this chapter even exists has to do more with the history of Dynamic HTML the capability to alter content on the fly in response to user interaction particularly with respect to Netscape Navigator 4. The impetus for this separate discussion is the NN4 LAYER element and its associated object. What makes this discussion awkward is that the LAYER element and object became dead-end entities that never made it into the W3C standards process. NN6 instead has adopted the W3C standards for dynamic content, which more closely mimic the way Microsoft implemented its DHTML features starting with IE4. NN6 explicitly does not provide backward compatibility with scripted LAYER element objects, which also means that you must rewrite legacy applications to work in NN6. That leaves an ungainly task in this chapter to create a bridge between the LAYER element and the more modern way of working with elements that can be positioned on the page, flown across the page, stacked in front of other elements, or hidden from view. The IE4+ and NN6 way to accomplish all of this is through CSS style sheets and the scripting thereof. In years to come, the NN4 LAYER element will be only a distant memory. Until then, we must acknowledge it and understand how to work the same magic with style sheets. To that end, this chapter provides details on both the NN4 layer object and the comparable syntax for using IE4+ and NN6 style sheets to get and set properties or invoke methods. Chapter 48 applies these techniques in some DHTML applications. What Is a Layer? Terminology in the area of positioned elements has become a bit confusing over time. Because NN4 was the earliest browser to be released with positioned elements (the LAYER element), the term layer became synonymous with any positioned element. When IE4 came on the scene, it was In This Chapter Layer concepts How to move, hide, and show content The end of the LAYER element ….
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