Opera: please use bug detection, not browser detection

On the bright side, it is often possible to write your fix in a non-invasive way, or adjust your code to not depend on the buggy behaviour. (For example, some browsers will still fire a keypress event if you cancel the corresponding keydown event. My code editor[1] ended up checking again in the keypress handler for keys that should have been handled, and cancelling them again.)

[1] http://marijn.haverbeke.nl/codemirror

Respect to Opera for blogging about this.

This is exactly as it should be: the burden should be on the browser developers to investigate bugs and write the tests they want web developers to use in their workarounds.