Design Updates that Impact Compatibility between Browsers

This section and the following table show the four major areas of compatibility (not in order of incidence or ranking of priority).

	Changes from Internet Explorer 6 to Internet Explorer 7	Changes from Internet Explorer 7 to Internet Explorer 8
Versioning	Version Vectors User Agent String	Version Vectors User Agent String
Standards	HTML 4.01 improvements CSS 2.1 improvements	Additional HTML 4.01 improvements Full CSS 2.1 compliance Some HTML 5.0 support ECMAScript 3rd edition support and some ECMAScript 5th edition support (including native JSON)
Security	HTTPS improvements More secure scripting Protected Mode (Windows Vista and later versions)	Better protection from malware DEP/NX & XSS filter on by default HTTP/HTTPS mixed mode AJAX more secure
Architecture	Loosely coupled Internet Explorer

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