Internet Explorer is a web browser launched by Microsoft Corporation of the United States. Microsoft Internet Explorer (before version 6) and Windows Internet Explorer (versions 7, 8, 9, 10,1) are referred to as IE for short. Before IE7, Chinese literally translated as "network pathfinder", but after IE7, it was officially called "IE browser".
Second, the main functions
1, component object model
Component object model (COM) technology has been widely used in Internet Explorer. It allows third-party vendors to add functions through browser help object (BHO); And allow websites to provide rich content through ActiveX. Because these objects can have the same permissions as the browser itself (in some cases), they are very concerned about security. The latest version of Internet Explorer provides an add-in manager to control ActiveX controls and browser help objects, and a "no add-in" version (under all programs/accessories/system tools).
2. Security architecture
Internet Explorer uses a zone-based security architecture, which means that websites are organized according to feature conditions. It allows a large number of functions to be restricted and only the specified functions to be restricted.
Patches and updates for browsers are released regularly through the Windows Update service and automatic updates.
The latest version of Internet Explorer provides download monitor and installation monitor, allowing users to choose whether to download and install executable programs in two steps. This can prevent the installation of malicious software. The executable file downloaded with Internet Explorer is marked as a potential unsafe factor by the operating system, and the user is always asked to confirm whether to execute the program until it is confirmed that the file is "safe".
3. Group principle
Internet Explorer can be fully configured through Group Policy. Windows server domain administrators can apply and implement a series of settings to change the user interface (such as prohibiting certain menu items and independent configuration options), as well as restricting security functions (such as downloading files), zero configuration, per-site settings, ActiveX control behavior, etc. Policy settings can be set on a per-user and per-machine basis.
4. Web standards
Internet Explorer uses Trident typesetting engine, and almost completely supports HTML 4.0 1, CSS Level 1, XML 1.0, DOM Level 1, except for some typographical errors. It also partially supports CSS level and DOM level. Its own XML interpreter supports XHTML, but Microsoft canceled this support after IE 5.0, which is difficult to access. Like other browsers, when the MIME type is identified as "text/html", it can be interpreted as XHTML. When MIME types are identified as "application/xml" and "text/xml", it can also interpret XHTML as xml, but it needs a small XSLT metric to re-enable xml's support for XHTML. When defined as a preferred type such as "application/xhtml+xml", it pretends not to know xhtml, but downloads it as an unknown file type.
5. Extended elements
Internet Explorer has introduced a series of patented web page standard extensions, including HTML, CSS and DOM.
6. Web standard support
Internet Explorer supports some standardization technologies to some extent. Generally speaking, web developers should be cross-platform when writing code, so code that can run on all major browsers is always essential.