A look at Internet Explorer from the inside out. Note: @EricLaw left Microsoft in October 2012. This blog may be adopted by an IE team member in the future.
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Proxy-Authentication breaks many applications
When I first joined Office, I worked on the team responsible for delivering Help, Templates, and ClipArt into the client applications. As we were testing our work in various simulated customer environments, we found a big problem. At least one big customer (tens of thousands of licenses) had a network...
3 Aug 2012
The Hazards of Browser Quirks, continued
My First Law of Browser Quirks was introduced a while ago : If there’s a way for a site to take dependency on a browser quirk, and break if that quirk is removed, it will happen . The Second Law of Browser Quirks is: If there’s a way for a site to combine a set of browser quirks to yield...
31 Jan 2012
URL Components in the DOM
The IE team has been working our way through the remaining issues reported from internal and external testing of the IE9 Release Candidate. In the course of investigating one recent internal-site compatibility bug, I ran across an interesting interoperability issue that appears to have existed since...
27 Feb 2011
Troubleshooting Authentication with Fiddler
Over the last few weeks, I’ve been exchanging mail with a webmaster (Vladimir) in Russia who reported that his customers were having problems using IE8 on Windows 7 to log into his website. His site uses HTTP Basic Authentication, so users are prompted to enter their credentials using the following...
22 Nov 2009
HTML5 Implementation Issues in IE8 (and IE9)
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
Internet Explorer Cookie Internals (FAQ)
Over the five years I’ve worked on Internet Explorer, I’ve probably seen more questions from the community about HTTP cookies than on any other topic. Cookies are an integral component of most websites in use today, and hence problems or unexpected behaviors with cookies tend to get a lot...
20 Aug 2009
Bugs in IE8's Lookahead Downloader
All bugs mentioned in this post are now fixed . Internet Explorer has a number of features designed to render pages more quickly. One of these features is called the "Lookahead Downloader" and it's used to quickly scan the page as it comes in, looking for the URLs of resources which will be needed...
27 Jul 2009
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