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Cascading Style Sheets (CSS) is a W3C standard mark-up language for defining the appearance of web pages. The use of CSS allows developers to fully separate the content of the page from its presentation, speeding up the development process and also making the pages load more quickly in the browser. Whereas 20th century websites typically used tables to construct web pages and position elements, CSS now provides a cleaner and more efficient way of controlling all aspects of web page layout.
Adobe Dreamweaver is a very widely used platform for developing web sites and web content and, although used by experienced developers, is also widely used by non-specialists for whom Dreamweaver's user-friendly visual interface takes the pain out of web site creation. The way in which Dreamweaver implements CSS is very important for the casual user, since it will influence the kind of sites they end up producing.
Dreamweaver CS3 is the first version of the program which assumes that the user will want to use CSS to control the layout of their web pages. To assist inexperienced and would-be web developers, each time a new page is created, the program allows the user to choose allocate a preset CSS layout to the page. There are about 30 such layouts and they come in single, double and three column varieties.
CSS page layout is based in the DIV element, an HTML container which can be used to hold an arbitrary amount of web content. The CSS rules control the appearance and positioning of DIVs on the page. Dreamweaver CS3's preset CSS layouts create a series of DIVs containing placeholder text and basic formatting. The placeholder text, as well as the code underlying the page, both contain useful explanations of how the page has been constructed and a few tips on how to personalise them.
CSS works most efficiently when you can place all of your CSS code in one external file and link that file to each of your HTML pages. Dreamweaver CS3 still does not make it easy for inexperienced users to create CSS-based pages in this way. If the user creates ten web pages based on Dreamweaver's preset CSS designs, each will have its own code embedded within the page itself. There is, however, a great feature for moving embedded code across to an external CSS file. You just select a series of CSS definitions, right-click and choose "Move CSS Rules" which is available in the "CSS Styles" section of the context menu.
This ability to move blocks of CSS is an excellent feature but one has to ask if new users will see its significance and actually use it. The fact is that, given the increasing importance of CSS and Dreamweaver's role as the fledgling developers best friend, the program could use some improvement in the way it handles CSS.
Another area where Dreamweaver still handles CSS inefficiently is the way in which it generates CSS class styles with names like "style1", "style2", etc. whenever the user applies attributes like font, size or colour to highlighted text. This must be really confusing for beginners and can easily be solved by simply removing these "raw" attributes and replacing them with CSS-friendly options.
About the Author, Andrew Whiteman:
The author is a training consultant with Macresource Computer Solutions, an independent computer training company offering Adobe Dreamweaver training courses at their central London training centre. Link directory.
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