DEALING WITH BROWSER DIFFERENCES
The W3C has revolutionized DHTML by making a single standard that both Netscape and Microsoft have committed to support. Nevertheless, neither supports it perfectly yet, and many users use old browsers. If your page relies on DHTML, you will need to account for all of these possibilities.
DHTML BROWSER DIFFERENCES
Back when the version 4.0 browsers were the latest thing, there were major differences between their supports for DHTML. If you wrote an application using DHTML for Internet Explorer 4.0, there were no chance at all it would work on Netscape 4.0.
Things are different now with the W3C DOM. Since both Internet Explorer 5 and later, and Netscape 6 and later are based on this standard, if you write an application for one of these browsers the chances are good it will work on the other.
However, neither browser supports 100% of the W3C DOM standard. As you use more specific properties and attributes, the chance increases that you'll run into a difference between the browsers.
There are two key things you can do to make sure the latest DHTML browsers support your scripts: First, test script in as many different browsers as possible. At the very least, you should have the latest version of Netscape and Internet Explorer available.
Second, you can use JavaScript to detect the user's current browser or the features it supports; you deal with difference by writing code for different browsers. Using this technique, you can support older browsers, as well as the latest.
DETECTING BROWSERS
If you plan to support more than one browser or even if you're restricting your page to certain browsers you'll need a way to detect which browser is in use. You can do this in one of two ways:
Detecting the exact browser in use (browser sensing)
Detecting whether a feature is supported (feature sensing)
BROWSER SENSING
The most obvious way to detect which browser is in use is to use the navigator object, which is supposed to contain a concise list of information about the user's browser. Listing 17.1 shows a simple script that displays the values of several navigator properties.
Listing 17.1 Displaying Information About the Browser
Browser Information
Browser Information
The navigator object contains the following information
About the browser you are using.
document.write("Code Name: " + navigator.appCodeName);
document.write("App Name: " + navigator.appName);
document.write("App Version: " + navigator.appVersion);
document.write("User Agent: " + navigator.userAgent);
document.write("Language: " + navigator.browserLanguage);
document.write("Platform: " + navigator.platform);
FEATURE SENSING
Supposed you've used browser sensing to check the Internet Explorer 5 or Netscape 6.
e)Mozilla/5.0 intiates the message the server need the browser version is need in http message because the sever sends prepare the formats to send to different browsers depending on request.
In English, this means that webservers can create web pages that will customize from user to user. By saving these preferences on your computer, the web page can reload appearing to your chosen options. This is accomplished by retrieving the cookie, through your browser, when you access the web page.
Yet, CSS is very useful in many scenarios, more and more healthcare delivery systems are converting to computers, ranging from client information, to keep track of finances.
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