Before you can develop a strategy for addressing various browsercapabilities, it is useful to have a general knowledge of the browsers that are out there. While web browsing clients are increasingly being built into small-display devices such as PDAs, telephones, and even car dashboards, this chapter focuses on the traditional graphical computer-based browsers that developers generally keep in mind.
The "Big Two"
The browser market is dominated by two major browsers: Microsoft Internet Explorer and Netscape Navigator. As of this writing, Internet Explorer is in Version 5.5 for Windows (5.0 for Macintosh) and the Navigator browser is one component of Netscape 6 (they did not release a Version 5). Together, the "Big Two," including their collective past versions, account for over 95% of browser use today.
Although Netscape's browsing component is still officially called Navigator, Netscape seems to be downplaying "Navigator" and promoting its latest product release simply as Netscape 6.
Most web authors base their designs on the functionality of Navigator and Internet Explorer on Windows systems, since they claim the lion's share of the market; however, there are a number of other browsers you may choose to take into consideration.
Internet Explorer on the Macintosh
For better or worse, Internet Explorer releases for the Macintosh platform have varied in functionality from their Windows counterparts. Web usage statistics indicate that Mac users account for just 2-3% of global web traffic, but if your site has Mac-targeted content, keep the following browser differences in mind.
IE 5.0 for the Mac (the current version as of this writing) was the first browser on any platform to be almost fully standards-compliant, thanks to its specially developed Tasman rendering engine. In general, you can treat Mac IE5.0 like Windows IE5.5 or Netscape 6.
The Macintosh version of IE4.0 lacks significant functionality found in its Windows sibling. This Mac version has no embedded font support, no support for CSS filters and transitions (such as drop shadow effects), and a very problematic DHTML implementation. Some of these issues wereaddressed in Version 4.5 (the first Mac version that significantly deviated from the Windows version). As a general guideline, treat Mac IE4.0 and 4.5 like Navigator 3.0.
America Online subscribers use a variety of Internet Explorer browsers, ranging from Version 2 to 5.5 (the most current as of this writing). The browser version number is not necessarily tied to the AOL release, as noted in this excerpt from AOL's developer site:
Beginning with Windows AOL 3.0 (32-bit), theAOL client does not have a browser embedded, but instead uses the Internet Explorer browser the user already has installed within their system. On the Mac and 16-bit Windows clients, theAOL client containsvarious versions of Internet Explorerembedded directly within the client, andindependent of the version ofInternet Explorer installed outside AOL in the system.
Therefore, browser compatibility is mostly independent ofany specific AOL version. As of this writing, approximately 80% of AOL users view the Web on Windows machines using Internet Explorer 5.0 or higher. While this is encouraging news, the reality is that Internet Explorer's functionality is limited somewhat when used in conjunction with the AOL client. This is due to the way the specific AOL clients interact with the browser and AOL's reliance on proxy servers and image compression techniques. Many web designers have been horrified to see their site design (which works perfectly in all the major browsers) once it's been run through the AOL system.
Fortunately, AOL publishes a site specifically for web developers who want their sites to be accessible and attractive to AOL users. Of particular use is the browser chart, which provides a specific listing of each of its browsers (by release and platform), the technologies and features supported, and a breakdown in percentage of users for each browser. It also provides a style guide for optimizing web pages for its newly released AOLTV set-top browsing device.
Because WebTV displays web pages on televisions, it introduces new concerns regarding color and screen size.
WebTV publishes a developers' resource where you can find specific information regarding developing sites for WebTV. It includes information on HTML and various web technology support.
You may also choose to download their free tool called WebTV Viewer (available for both Windows and Mac, although the Windows version is more up to date as of this writing). WebTV Viewer shows how your web page will look and perform on WebTV, right from the comfort of your own computer.
Opera, in Version 5.0 as of this writing, is a lean and mean little browser created by Opera Software in Oslo, Norway. It is currently available for Windows and Linux platforms, although the Opera 5 for Mac beta version was released in mid-2001. Opera is free if you don't mind ad banners as part of the interface. To register the browser and get rid of the ads, the price is $39.
Opera boasts extremely quick download times and a small minimum disk requirement (around 2 MB, compared to IE's 24 MB download). Opera is respected for its exact compliance with HTML standards. Sloppy tagging that gets by the larger browsers (such as missing closing tags, improper nesting, etc.) does not render correctly in Opera.
The general public is not likely to flock to Opera, and it never so much as blips in the browser statistic charts; however, many designers continue to test their sites in Opera to make sure their code is clean.
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