This blog is closed as of 2/2015. @EricLaw left Microsoft in 2012, but was named an IE MVP in '13 & an IE userAgent (http://useragents.ie) in '14.
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URL Length Limits
Today’s question is a simple one: “What is the maximum URL length supported by Internet Explorer?” And the answer, as befitting an IEInternals post, is surprisingly complicated. The simplistic answer is that WinINET.h defines INTERNET_MAX_URL_LENGTH as 2083 characters, and this...
13 Aug 2014
What I’d like to see in IE12
As the holidays approach, I’ve decided to publish my “wishlist” for the next version of Internet Explorer. I’ve been pretty good this year, so hopefully the IE team will deliver some of these presents. :-) Please remember: I’m just an MVP, and I don’t have any magic...
11 Dec 2013
Debugging in IE10 on Windows 8
Emulating the “non-Desktop Experience” in the Desktop Experience The new full-screen “fast and fluid” experience of IE10 on Windows 8 offers many improvements over Internet Explorer 10 on the Desktop (ranging from UX to Security), but one thing it lacks is the F12 Developer...
5 Sep 2012
For over a decade, Internet Explorer has enabled developers to extend the browser with new URL protocol schemes. These protocols can be one of two types: Asynchronous Pluggable Protocols - COM objects that implement the IInternetProtocolRoot interface and return content to URLMon, usually for rendering...
13 Jul 2011
Integrated Windows Authentication
Inside Internet Explorer’s Tools > Internet Options > Advanced dialog, there’s an option named Enable Integrated Windows Authentication : This preference is stored using a REG_DWORD named EnableNegotiate inside HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings...
6 Jul 2011
Stylesheet Limits in Internet Explorer
KB 262161 outlines the maximum number of stylesheets and rules supported by Internet Explorer 6 to 9. A sheet may contain up to 4095 rules A sheet may @import up to 31 sheets @import nesting supports up to 4 levels deep Some folks have wondered about the math that underlies these numbers...
14 May 2011
A Primer on Temporary Internet Files
On Windows Vista and above, Internet Explorer’s Temporary Internet Files are maintained in two isolated WinINET cache containers. One cache is used for sites loaded in Protected Mode (Internet Zone and Restricted Zone) and the other cache is used for sites loaded outside of Protected Mode (Trusted...
19 Mar 2011
File Upload and Download Limits
Over the last few years, we’ve had a few questions about WinINET’s limits for file upload and download. I’ve summarized those limits in the following table: Upload (total size) Download (per file) Internet Explorer 6 2gb 2gb...
10 Mar 2011
SOCKS Proxies in Internet Explorer
We recently had a report over on the IEBlog that SOCKS proxies are not supported by IE9 Beta. That observation is correct, and a regression from prior versions of Internet Explorer; IE9 Beta simply ignores the SOCKS proxy if one is specified in the Internet Control panel. Update: This regression,...
8 Oct 2010
Trivia: Animated GIF Timing
Every now and again, someone reports that Internet Explorer is "slow" when rendering an animated GIF file. Typically, they'll load a lengthy animation in Firefox and IE and note that it runs much more quickly in Firefox. Similarly, Chrome and Safari are "slow" while Opera is "fast." Conversely, there...
7 Jun 2010
Downloads and International Filenames
A few times a year, I get a question about Internet Explorer's behavior when it comes to downloading files that have non-ASCII characters in the filename, because different browsers have different behavior when handling such files. The server can suggest the name for a file download in one of two...
7 Jun 2010
XDomainRequest - Restrictions, Limitations and Workarounds
Update : Internet Explorer 10+ supports CORS using XMLHTTPRequest . IE11 deprecates the XDomainRequest object and it is not available in IE11 Edge mode. In Internet Explorer 8, the XDomainRequest object was introduced. This object allows AJAX applications to make safe cross-origin requests directly...
13 May 2010
HTTPS Caching and Internet Explorer
From time-to-time, I get questions about Internet Explorer’s behavior when it comes to caching of HTTPS-delivered content. It comes as a surprise to many that by-default, all versions of Internet Explorer will cache HTTPS content so long as the caching headers allow it . If a resource is sent...
21 Apr 2010
Forcing Internet Explorer To Forget To Not Remember
All joking aside, last fall, I wrote about the variety of reasons why Internet Explorer might not offer to remember your password on a web form. As I mentioned then, you will not be re-prompted to save your password if you’ve previously declined to store the password for this username on this page...
8 Apr 2010
COMET Streaming in Internet Explorer
The request/response nature of HTTP works very well for traditional web pages, but to build dynamic AJAX applications, it’s often desirable for the server to be able to send data to the client on its own schedule. You could imagine, for instance, scenarios like an online game, or an event viewer...
5 Apr 2010
Preventing Automatic Hyperlinking in ContentEditable HTML
Today, a question from the mail bag… Q: Is there a way to stop IE from “auto-magically” recognizing and creating hyperlinks inside HTML? First, a bit of context. Web developers can use the ContentEditable property to allow users to edit part of a HTML page. This mechanism is often used to allow...
17 Sep 2009
HTML5 Implementation Issues in IE8 (and later)
IE8 introduced support for some of the more stable features in the HTML5 spec. However, web developers have reported some problematic scenarios in IE8's support for these features, as described below. 1. postMessage only works for IFRAMES/FRAMES The HTML5 postMessage function provides a great way...
15 Sep 2009
Vary with Care
About the Vary Response Header As described in the HTTP/1.1 specification ( RFC2616 ), the Vary response header allows a cache to determine if a cached (still fresh) response may be returned for a subsequent request, based on whether or not the new request's headers match those that were sent when...
17 Jun 2009
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