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I had never seen this css border trick for drawing triangles. It works in IE7+. Bootstrap uses the same technique.

Really? Maybe that's because you've never asked in the form of a URL: http://cssarrowplease.com/

Awesome!

Yours is actually better because it works in IE7.

I really hate these sites that don't tell you what browsers are supported.

really awesome. love simple tools!

Yes, it's quite nice. The idea came from here