“Continue” Link Missing from Certificate Error Page?

A user recently reported that IE11 wasn’t showing the “Continue” link on the certificate error page shown when visiting their 2009-era router’s configuration UI. They were curious why that link wasn’t shown in this instance. The error page’s Continue link is hidden: If the certificate is revoked If the certificate is deemed insecure (e.g. contains…


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 powers that would guarantee that any of my…


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” that’s not a bug in the IE UI….


Strict P3P Validation

Internet Explorer offers users many tools to help protect their privacy, including InPrivate Browsing, cookie controls (including P3P), and Tracking Protection Lists. In February of 2012, the IE team described how a misleading P3P statement was being used to circumvent users’ privacy settings. Default P3P Restrictions Internet Explorer’s default settings restrict the use of 3rd…


Understanding Web Proxy Configuration

Over the last decade, I’ve come to learn a lot about web proxies, having chosen to implement my web debugger as a proxy. In today’s post, I’ll provide an overview of proxy-related information, including information on changes in Internet Explorer 11 / Windows 8.1. The “System Proxy” Unlike on other systems like Mac OSX, Windows…


IE11 Changes

In the past, I’ve published “Minor changes” lists for IE9 and IE10. The goal of those lists was to briefly document changes that might not be recorded elsewhere. This time around, I’m aiming to provide broader coverage of changes in IE11, including major new features and APIs. While this won’t be the best place to…


Internet Explorer 11’s Many User-Agent Strings

If you found this post, chances are good that you’re searching for IE11’s User-Agent string. Why? Were you planning to control your website’s behavior based on the browser “sniffed” from the User-Agent (UA) string? Please don’t; use feature detection instead (Ref1, Ref2). Poorly implemented (non-futureproof) User-Agent sniffing has proven to be the top compatibility problem…


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 the “least you need to know.” P3P Made Simple By default, IE will reject cookies…


History and the TravelLog

Internet Explorer keeps track of your browsing history in two ways. The active tab’s list of the back/forward navigations is called the TravelLog. You can see this list with a click-and-hold on the back or forward arrow: The list of pages you’ve visited across all browser sessions is called History. You can see it by…


Fun with Favicons

Last week, Ray Sun wrote a short post about the origins of the Favicon, the little “site icon” you see on the tab when you visit a website in any major desktop browser. The cool thing about using the .ICO format as the basis of Favicons is that it is a container format that can…