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Fast Page Rendering and Data Processing
Performance Improvements Internet Explorer has support for "fixed" table layouts. This renders tables much faster, as the "fixed" table layout allows Internet Explorer 5.0 to display the table without calculating the minimum and maximum size of the cells. Because the extra calculation is not needed, table data can be displayed on the page, even while the rest of the table is still loading. This feature is particularly advantageous with tables used to display spreadsheet-like data, and for tables used for layout when the width of the columns is known at design time.
HTTP-Expires Header Internet Explorer 5.0 won't automatically check the network first when an object from the cache has not yet expired. Network traffic is thus reduced and performance improved.
Improved Performance Large documents built with Dynamic HTML and pages with DataBinding technology have a new efficient rendering engine, allowing content to appear significantly faster than with Internet Explorer 4.0.


Enables Enterprise-Ready Applications
Multiple CSS class support Any element can take a list of CSS classes, making it much simpler to write script when different actions are to occur on a single element. For example, it's much shorter to write the code for a picture that changes once when the mouse moves over it, and then again when it is clicked.
XML Support XML can be embedded into a document as data or meta-data, with the entire XML Document Object Model exposed. XML tags can also be intermixed within the HTML document, where CSS properties can be directly applied to them, thereby controlling their appearance.
Dynamic Properties Instead of creating long, complicated scripts to perform relatively simple activities, now any property on a page can be defined as a function of any other property. For example, the font size of a section of text can be set to 20% of the width of a table or the whole page, and then the font size will change dynamically (almost like a Microsoft Excel formula recalculating) if the page is resized, without refreshing the page from the Web server.
"CurrentStyle" Object The currentStyle object exposes the exact value that each element on a page is using for all of its CSS properties, not just the ones that have been explicitly placed on that object.
Dynamic Relative / Absolute Positioning Support Authors can enable actions like Drag and Drop functionality in their applications much easier, as elements can be placed on a page with Relative Positioning, but can then revert to an Absolute Position "on the fly."
Full Drag and Drop Object Model Support While users have always had a rich way of sharing content between applications with drag and drop, Microsoft has extended the Internet Explorer object model to provide further mouse actions, such as cursor control, drag initialization, and clipboard support, to create even richer applications. You can now build applications that allow users to drag content between frames and even to other applications.
Retaining Persistence Any element on a page, such as a collapsible outline, can remain in its current state, even when your users leave that page and return later. While developers have had a limited way to do this in the past with cookies, Internet Explorer's new persistence technology provides a richer XML-based way to accomplish this, thus eliminating the cookie 4K limit.
Client Capabilities In order for content providers and authors to provide the best level of content for their users, it's becoming crucially important for these developers to know not only what version of each browser is being used, but also what technologies have been turned on or off by the user. Through scripting, authors can query which features of the browser are available or not (perhaps Java or ActiveX has been disabled), so that they can serve up the right content, and have the pages appear exactly as intended on the clients' platform.
<HTMLAREA> Internet Explorer 5.0 introduces a new intrinsic control similar to text boxes or drop-down boxes, allowing developers to insert a separate HTML-enabled area into their pages where users can insert content. This will allow users to insert comments or any content they wish, and embelish it with all the power and functionality of HTML.
Browser-less applications (.hta) Applications are being built today with the powerful technologies that the Internet brings, from HTML to scripting, ActiveX, and Java. However, it doesn't always make sense to require these applications to appear inside a browser. By building a "browser-less" application, developers can create anything from a calculator to a 401K tool that is not cluttered by the user interface of browsing software.
New Debugging Messages When debugging an application, authors need descriptive feedback to know exactly where problems may be occurring. The Error messages in Internet Explorer 5.0 have been improved to provide detailed messages about scripting errors, HTML structure errors, and other useful information for diagnosing application errors. This option is turned off by default for the majority of users who are simply browsing the Web.


Extensibility and Componentization
DHTML Behaviors Just as Cascading StyleSheets enabled Web site producers to separate the content of a page from its format, DHTML Behaviors extends that idea to separate Behaviors as well. This allows developers to build re-usable scripts that Web pages can simply reference. For example, you can write a script that tells text or pictures to fly in from the right side of the page. This script can be referenced from any page simply by calling its name and pointing to it. This allows writers to focus on content, graphic designers to focus on format, and developers to focus on engineering.
WebBrowser Control Updated to Internet Explorer 5.0 Any applications that are currently embedding Internet functionality with the Internet Explorer WebBrowser (AOL, Quicken, FrontPage, etc.) are automatically upgraded to Internet Explorer 5.0, when installed on the user's PC.