With metro IE 10 for windows 8, I assumed that I could use F12 to open developer tools, just like it was possible in every IE since 8.
However, in windows 8 that doesn't seem to do anything - has it been removed or is it accessible in another way?
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You can always still use Firebug Lite.
This feature is not available for Metro applications but should still work for Desktop applications.
As an alternative you might want to use Fiddler instead which allows you to at least debug the traffic happening between the Metro browser and the internet. For rendering, it should suffice to check the Desktop version of the browser as they share the renderer, and also have the same JS engine.