Web Design and Tableless Web Design
PCBizness Technosoft Pvt. Ltd.
Web Design and Tableless Web DesignWeb design encompasses many different skills and disciplines in the production and maintenance of websites. The different areas of web design include web graphic design; interface design; authoring, including standardised code and proprietary software; user experience design; and search engine optimization. Often many individuals will work in teams covering different aspects of the design process, although some designers will cover them all. The term web design is normally used to describe the design process relating to the front-end (client side) design of a website including writing mark up. Web design partially overlaps web engineering in the broader scope of web development. Web designers are expected to have an awareness of usability and if their role involves creating mark up then they are also expected to be up to date with web accessibility guidelines.
Web designers use a variety of different tools depending on what part of the production process they are involved in. These tools are updated over time by newer standards and software but the principles behind them remain the same. Web graphic designers use vector and raster graphics packages to create web-formatted imagery or design prototypes. Technologies used to create websites include standardised mark-up, which can be hand-coded or generated by WYSIWYG editing software. There is also proprietary software based on plug-ins that bypasses the client’s browser versions. These are often WYSIWYG but with the option of using the software’s scripting language. Search engine optimisation tools may be used to check search engine ranking and suggest improvements.
Other tools web designers might use include mark up validators and other testing tools for usability and accessibility to ensure their web sites meet web accessibility guidelines
Web development tools allow web developers to test and debug their code. They are different from website builders and IDEs in that they do not assist in the direct creation of a webpage, rather they are tools used for testing the user facing interface of a website or web application.
Web development tools come as browser add-ons or built in features in web browsers. The most popular web browsers today like, Google Chrome, Firefox, Opera, Internet Explorer, and Safari have built in tools to help web developers, and many additional add-ons can be found in their respective plugin download centers.
Web development tools allow developers to work with a variety of web technologies, including HTML, CSS, the DOM, JavaScript, and other components that are handled by the web browser. Due to the increasing demand from web browsers to do more popular web browsers have included more features geared for developers.
Tableless Web Design
Tableless web design (or tableless web layout) is a web design philosophy eschewing the use of HTML tables for page layout control purposes. Instead of HTML tables, style sheet languages such as Cascading Style Sheets (CSS) are used to arrange elements and text on a web page.CSS was introduced in December 1996 by the W3C to improve web accessibility and to make HTML code purely semantic rather than presentational. Around the same time, in the late 1990s, as the dot-com boom led to a rapid growth in the "new media" of web page creation and design, there began a trend of using HTML tables, and their rows, columns and cells, to control the layout of whole web pages. This was due to several reasons:
the limitations at the time of CSS support in browsers;
the new web designers' lack of familiarity with CSS;
the lack of knowledge of, or concern for the reasons (including HTML semantics and web accessibility) to use CSS instead of what was perceived as an easier way to quickly achieve the intended layouts, and
a new breed of WYSIWYG web design tools that encouraged this practice.
The advantages of restricting the use of HTML tables to their intended and semantic purpose include improved accessibility of the information to a wider variety of users, using a wide variety of user agents. There are bandwidth savings as large numbers of semantically meaningless <table>, <tr> and <td> tags are removed from dozens of pages leaving fewer, but more meaningful headings, paragraphs and lists. Layout instructions are transferred into site-wide CSS stylesheets, which can be downloaded once and cached for reuse while each visitor navigates the site. Sites may become more maintainable as the whole site can be restyled or re-branded in a single pass merely by altering the mark-up of the specific CSS, affecting every page which relies on that stylesheet. New HTML content can be added in such a way that consistent layout rules are immediately applied to it by the existing CSS without any further effort.
Some developers are now afraid to introduce a simple HTML table even where it makes good sense, some erring by the overuse of span and div elements, perhaps even with table-like rules applied to them using CSS.
Advantages of Tableless Web Design
Accessibility
Because of the Internet's rapid growth, expanding disability discrimination legislation, and the increasing use of mobile phones and PDAs, it is necessary for Web content to be made accessible to users operating a wide variety of devices. Tableless Web design considerably improves Web accessibility in this respect.
Screen readers and braille devices have fewer problems with tableless designs because they follow a logical structure. The same is true for search engine Web crawlers, the software agents that most web site publishers hope will find their pages, classify them accurately and so enable potential users to find them easily in appropriate searches.
As a result of the separation of design (CSS) and structure (HTML), it is also possible to provide different layouts for different devices, e.g. handhelds, mobile phones, etc. It is also possible to specify a different style sheet for print, e.g. to hide or modify the appearance of advertisements or navigation elements that are irrelevant and a nuisance in the printable version of the page.
The W3C's Web Content Accessibility Guidelines' guideline no. 3 states "use markup and style sheets and do so properly." The guideline's checkpoint 3.3, a priority-2 checkpoint, says "use style sheets to control layout and presentation."
Bandwidth savings
Tableless design produces web pages with fewer HTML tags used purely to position content. This normally means that the pages themselves become smaller to download. The philosophy implies that all the instructions regarding layout and positioning be moved into external style sheets. According to the basic capabilities of HTTP, as these rarely change and they apply in common to many web pages, they will be cached and reused after the first download. This further reduces bandwidth and download times across the site.
Maintainability
Maintaining a website may require frequent changes, both small and large, to the visual style of a website, depending on the purpose of the site. Under table-based layout, the layout is part of the HTML itself. As such, without the aid of template-based visual editors such as HTML editors, changing the positional layout of elements on a whole site may require a great deal of effort, depending on the amount of repetitive changes required. Even employing sed or similar global find-and-replace utilities cannot alleviate the problem entirely.
In tableless layout using CSS, the layout information may reside in a CSS document. Because the layout information may be centralized, it is possible that these changes can be made quickly and globally by default. The HTML files themselves may not need to be adjusted when making layout changes.
Also, because the layout information may be stored externally to the HTML, it may be quite easy to add new content in a tableless design, whether modifying an existing page or adding a new page. By contrast, without such a design, the layout for each page may require a more time-consuming manual changing of each instance or use of global find-and-replace utilities. However site owners often want particular pages to be different from others on the site either for a short period or long term. This will often necessitate a separate style sheet to be developed for that page.
On the other hand, due to browser inconsistency and a particular web designer's implementation of tableless design, it may not be clear at first glance exactly how a tableless web page is constructed. While it is convenient to have markup language residing in a single CSS file, it can split layout logic unnecessarily. Browser inconsistencies can increase the risk of web pages failing to render properly which increases the need for maintainability.
The use of tables
On the one hand, because of the term "tableless web design", some have interpreted this design strategy as an unconditional repudiation of all tables in web design. This has caused some to avoid tables even when tables are appropriate. Using divisions to simulate a table for the display of tabular data is as much a design flaw as using tables to control graphic and page layout. Some sources clarify this distinction by using the more specific term "tableless web layout".
On the other hand, using tables in web design, although most common, does not necessarily equate to using the table element defined in HTML 4.0. CSS also specifies a "table model" which allows the layout of tables to be applied to any element using the "display: table" CSS declaration.One reason this technique is sometimes overlooked is the lack of support for the CSS table model in Internet Explorer versions earlier than 8. Internet Explorer 8 is the first version of the browser to support the CSS table model.
posted by Unknown @ 21:07
0 Comments
