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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Why do Tab buttons resize temporarily?
Have you ever noticed that when you close a tab in IE using the tab’s red-X button (or middle-click): …the tab to the left gets wider (or narrower)? If you then move your mouse, then the tab button size goes back to normal: This is probably the most commonly reported “bug”...
20 Nov 2013
A Quick Look at P3P
Internet Explorer supports a cookie-restricting privacy feature called P3P. Web developers often get tripped up by it because no other browser implements the P3P standard. I’ve written about IE’s cookie control features previously (and more comprehensively), but here’s a summary of...
17 Sep 2013
Same Origin Policy Part 2: Limited Write
In Part 1 of this series, I described how Same Origin Policy prevents web content delivered from one origin from reading content from another origin. (If you haven’t read that post yet, please do start there.) In today’s post, we’ll look at what restrictions are placed on writing...
2 Apr 2012
Detecting Captive Network Portals
18 May 2011
Internet Explorer 9 Help Files Online
In Internet Explorer, if you press F1 or use the Help menu, the Windows Help and Support screen will show. However, you may find that you always see a Topic not found error message. The reason is that Internet Explorer 9’s help files are available only online. To see the help content...
24 Apr 2011
YouTube and Save Video As
An amusing April Fool’s satire I ran across yesterday reminded me of a Connect bug that was reported back in the IE9 Beta. The HTML <video> control’s default context menu includes a “Save Video As…” menu option that allows saving the video to disk: The...
2 Apr 2011
What is msimgsiz.dat?
Inside your Temporary Internet Files folder you likely have a file named msimgsiz.dat . If you open this file, you’ll find that it contains nothing but binary goo: Over the years, many people have asked or speculated about what this file is used for, and the answer is actually quite simple...
19 Mar 2011
Understanding the IE9 Software Rendering Mode
I recently heard from some users who are seeing lower-than-expected scores on the Speed Reading and FishIE Tank benchmarks. I went to check these tests myself and found that my laptop’s score was low. In fact, it was much lower than I’d seen last year. What happened? First, a bit of background...
16 Feb 2011
How to Uninstall Internet Explorer 9 Beta
If you want to remove Internet Explorer 9 beta from your computer and go back to your older version of IE, you can do so by simply following these steps.
16 Sep 2010
Same Origin Policy Part 1: No Peeking
Despite its role as the cornerstone of web application security, it’s clear that many (most?) web professionals do not understand Same Origin Policy (SOP), or hold one or more misconceptions about what SOP requires. It’s a big topic, and I don’t plan to address it all on this quiet...
28 Aug 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
Q&A: Rendering Mode for Web Browser Controls (WebOCs)
Q: Eric, you mentioned that the IE8 Web Browser Control, hosted in Forms / WPF, runs in IE7 emulation mode by default. Is there a way to turn the emulation mode off and have the control work in "real" IE8 mode? A: Yes. This is controlled by a feature control key. See Matt Crowley's post on Rendering...
1 Jul 2009
Think of the children!
Another question from the audience today: Q: I like IE8's InPrivate Browsing feature , but I'm worried that it won't let me see what my kids are up to. Can I prevent them from using it? A: Yes. When you enable the Windows Parental Controls feature, or use the Windows Live family safety tool, Internet...
16 Jun 2009
Slowing Down: Disabling the Accelerator icon
We've had a few folks write to the IEBlog asking " How can I disable the little blue accelerator icon that appears when text is selected in a HTML page? " For end users, the answer is straightforward: Click Tools > Internet Options > Advanced , and untick Display Accelerator button on selection...
2 Jun 2009
Q&A: 64-Bit Internet Explorer
From time to time, folks ask a variety of questions about 64bit IE. I hope to answer the most common questions here. NEW : Internet Explorer 10+ uses x64 in a fundamentally different way than IE7, IE8, and IE9, the versions for which the post below was written. By default, IE10+'s frame/manager process...
29 May 2009
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