Browsers
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Transcript of Browsers
Browsers
Browsers
xxx
Browsers
What is a Browser?
Browsers
A web browser, is the program you use to view pages and navigate the World Wide Web.
Browsers
A wide array of web browsers is available for just about every platform you can imagine.
Browsers
Most browsers are freeware or shareware or have a lenient licensing policy.
Browsers
What the Browser Does
Browsers
The core purpose of a web browser is to connect to web servers, request documents, and then properly format and display those documents.
Browsers
Web browsers can also display files on your local computer, download files that are not meant to be displayed, and in some cases even allow you to send and retrieve email.
Browsers
What the browser is best at, however, is dealing with retrieving and displaying web documents.
Browsers
What the browser is best at, however, is dealing with retrieving and displaying web documents.
Browsers
Each web page is a file written in a language called the Hypertext Markup Language (HTML) that includes the text of the page, a description of its structure, and links to other documents, images, or other media.
Browsers
The browser takes the information it gets from the web server and formats and displays it for your system.
Browsers
Different browsers might format and display the same file in diverse ways, depending on the capabilities of that system and how the browser is configured.
Browsers
Retrieving documents from the Web and formatting them for your system are the two tasks that make up the core of a browser’s functionality.
Browsers
Depending on the browser you use and the features it includes, however, you also might be able to play Flash animations, multimedia files, run Java applets, read your mail, or use other advanced features that a particular browser offers.
Browsers
What are some popular browsers
Browsers
• Microsoft Internet Explorer• Mozilla FireFox• Google Chrome• Safari• Opera
Browsers
What are plugins?
Browsers
Plug-ins such as the Flash player, QuickTime player, and others, are small helper programs (components) that extend the browser to support new functionality. Plug-ins are primarily a Netscape technology and have been around since Netscape Navigator 2.
Browsers
They are supported by some other browsers, notably Opera. The embed element used to reference plug-ins is also supported under Internet Explorer, although it does result in the launch of an ActiveX control (a similar Microsoft technology).
Browsers
Although plug-ins can go a long toward extending the possible capabilities of a browser, the technology does have its drawbacks. Users must locate and download plug-ins, install them, and occasionally even restart their browsers. Many users find this rather complicated.
Browsers
Beginning with Netscape 4.x, some installation relief was found with somewhat self-installing plug-ins and other features, but plug-ins can still be occasionally troublesome for users.
Browsers
To further combat this problem, many of the most commonly requested plug-ins, such as Flash, is being included as a standard with some browsers.
Browsers
However, even if installation were not such a problem, plug-ins are not available for every machine; an executable program, or binary, must be created for each particular operating system.
Browsers
Because of this machine-specific approach, many plug-ins work only on Windows-based systems.
Browsers
A decreasing number of plug-ins work on Macintosh and even less on Linux or UNIX.
Browsers
Finally, each plug-in installed on a system is a persistent extension to the browser, and takes up memory and disk space.
Browsers
What are the benefits of using plugins?
Browsers
The benefit of plug-ins is that they can be well integrated into Web pages.
Browsers
You include them by using the <embed> or <object> tag. Typically, the <embed> syntax is used, but the <object> syntax is the preferred method because it is part of the XHTML specification and will, therefore, validate.
Browsers
Browser Comparison
Browsers
Not all web browsers are created equal.
Browsers
Even though you may have standard compliant valid websites, your website may look different in different browsers.
Browsers
This is because not all web browsers are not compliant with W3 standards.
Browsers
How do we know if our browser is standards compliant?
Browsers
The Web Standards Group have developed a testing procedure called an Acid 2 Test.
Browsers
What is an Acid 2 Test??
Browsers
Acid2 is a test page published and promoted by the Web Standards Project to expose web page rendering flaws in web browsers and other applications that render HTLM
Browsers
Acid2 tests aspects of HTML markup, CSS 2.1 styling, PNG images, and data URIs.
Browsers
The Acid2 test page will be displayed correctly in any application that follows the World Wide We Consortium and Internet Engineering Task Force specifications for these technologies.
Browsers
These specifications are known as web standards because they describe how technologies used on the web are expected to function.
Browsers
Let’s look at some browsers that have gone through the Acid2 Test
Browsers
Let’s look at some browsers that have gone through the Acid2 Test
Internet Explorer 6
Internet Explorer 7
Mozilla Firefox 2
Mozilla Firefox 3
Safari 3
Opera 9
