IE9 Renderer Crash

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IE9 Went into Compatibility Mode; Renderer Crash

Xah Lee, 2011-03-14

IE9 is released today. After installing, it asks you to restart Windows. Alright. First thing i did is to check my website. Within 30 seconds, on this page Xah Emacs Tutorial, i got this error: “A problem displaying caused Internet Explorer to refresh the webpage using Compatibility View.” as a pop-up pane at the bottom of the window. Part of the page is not rendered, and part of it disappears when you move your mouse to the navigation menu. Great!

Here's a few screenshots:

Not shown in the screen shot, but half of the page content at the bottom does not show at all, doesn't matter it's in compatibility mode or not. The page isn't using any bleeding edge CSS nor wild javascript, and is valid html4 transitional.

A 5 second web search you found this page: IE has refreshed this page in Compatibility View due to a problem @ Source That user reports that IE9 went into compatibility mode for a HTML5 site.

According to a comment from apparently a IE developer, quote:

this means you've found an IE bug called a "hard assert" which is similar to a crash in the rendering engine. We're interested in finding and fixing these; please file a bug at Thanks! – EricLaw -MSFT- Oct 1 '10 at 14:31

Rendering engine crash! Great!

When i tried to copy & paste the error text when writing this blog, the text cannot be copied.

And on some pages, it tells me i need Flash plug-in, but Flash was displayed right there in tabs i opened before...

After 3 min reading web about their compatibility mode, it's one complex shit.

So, my first impression of IE9: go home & die.

Other IE9 Problems

Here's random list of IE9 problems. I'm adding them here as i found them.

When dragging a image to desktop, a pop-up dialog comes up with message “Are you sure you want to copy o move files to this folder? You should only copy or move files from locations that you trust. Yes No”. Quite annoying. Idiotic.

• The tabs gets very crowded.

• When there are more tabs than the space allows, it shows a little triangle icon tab on the left and right sides of the tabs. Hard to use.

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