IEInternals

A look at Internet Explorer from the inside out. @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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  • Blog Post: 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”...
  • Blog Post: 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...
  • Blog Post: 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...
  • Blog Post: Detecting Captive Network Portals

    Over on SuperUser , there’s a great explanation of how Windows determines whether a newly-connected network has a proper Internet connection, or whether the user should open a browser to login or click through a Terms of Use agreement. The general idea is that Windows will attempt to download a...
  • Blog Post: 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...
  • Blog Post: 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...
  • Blog Post: 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...
  • Blog Post: 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...
  • Blog Post: 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.
  • Blog Post: 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...
  • Blog Post: 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...
  • Blog Post: 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...
  • Blog Post: 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...
  • Blog Post: 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...
  • Blog Post: 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...
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