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

March, 2011

  • IEInternals

    IE9 Standards Mode Accepts only text/css for stylesheets

    • 8 Comments
    I recently encountered a blog that isn’t looking right in IE9: The site renders just fine in other browsers, and when the page is put into Compatibility View by ticking the icon in the address bar: What’s going on here...
  • IEInternals

    HTTPS and Keep-Alive Connections

    • 20 Comments
    As we explore network performance on the “real-world web”, one bad pattern in particular keeps recurring, and it’s not something that our many IE9 Networking Performance Improvements alone will resolve. The bad pattern is the use...
  • IEInternals

    Misbehaving HTTPS Servers impair TLS 1.1 and TLS 1.2

    • 8 Comments
    Back in the summer of 2009, I blogged about Windows 7’s new support for TLS 1.1 and TLS 1.2 . These new protocols are disabled by default, but can be enabled using Group Policy or the Advanced Tab of the Internet Control Panel: Some...
  • IEInternals

    Understanding Local Machine Zone Lockdown

    • 6 Comments
    Recently, a colleague sent me an email which provided a flashback into my own past: Hey, Eric-- Why do we show this when opening HTML locally? What are we protecting the user from? -Ben I myself had sent an email with almost...
  • IEInternals

    Everything you need to know about Authenticode Code Signing

    • 26 Comments
    In today’s post, I’ll be discussing the use of Authenticode to sign software programs; this post will be of interest primarily to software developers. Large software companies (like Microsoft) often have an entire team dedicated to the code...
  • IEInternals

    IE9 Final RTW Minor Changes List

    • 7 Comments
    This is the third and last post in the Minor Changes series; it covers changes in the final Release-to-Web (RTW) version of Internet Explorer 9. IE9 Beta Minor Changes List IE9 Release Candidate (RC) Minor Changes List The Release Candidate...
  • IEInternals

    A Primer on Temporary Internet Files

    • 17 Comments
    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...
  • IEInternals

    What is msimgsiz.dat?

    • 1 Comments
    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...
  • IEInternals

    IE9 - Debugging a Canvas Game

    • 6 Comments
    A few weeks ago , I discussed one compatibility issue we’d found when running a new HTML5 game . The game’s developers quickly fixed their site to return a proper character set declaration and we were able to get the game running in IE9. However...
  • IEInternals

    File Upload and Download Limits

    • 10 Comments
    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)...
  • IEInternals

    Beware Cookie Sharing in Cross-Zone Scenarios

    • 7 Comments
    Note: I mentioned this problem before ( Troubleshooting Login Cookies #3 ) but it was buried in a long post and this is an issue that lots of folks inside Microsoft hit, so I’m pulling it out into its own post. The Problem From time to time...
  • IEInternals

    Content-Length in the Real World

    • 7 Comments
    Earlier in IE9 , we tried to change the WinINET networking component to reject as incomplete any HTTP responses for which the Content-Length header specified more bytes than the server actually sent back. It turns out that some sites and applications...
  • IEInternals

    IE9 - XBAPs Disabled in the Internet Zone

    • 9 Comments
    As I mentioned last month , .NET Framework XAML Browser Applications ( XBAPs ) are now prevented from loading from the Internet Zone in IE9. When visiting an Internet site that utilizes an XBAP , an error message is shown, indicating that the application...
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