Over on my other blog, I just posted an article showing how you can use Fiddler to find bugs in applications that don't expect authenticating proxies.

This morning, someone asked me to look into a site-compatibility problem on a HTML5 demo site. When loading the site into IE9 and IE10, the F12 Developer Tools’ Script Debugger showed the following error: Now, obviously, IE does support getElementsByTagName, and I confirmed that the...

Often, the IE team will encounter a problem in a complicated production website, and will need to "reduce the repro" in order to determine the root cause of a given bug. This is made more complicated by the fact that sometimes the live website will change under us and we may lose the repro before the...