Detect if Chrome DevTools are open (Example)

Here's an interesting snippet taken from the validation code in the new Discover DevTools course prepared by Google and CodeSchool (check it out, btw, it's awesome!): function () { console.profile(); console.profileEnd(); if(console.clear) { console.clear() }; return console.profiles.length > 0; } It exploits the fact that CPU profiles aren't actually run if DevTools are closed. Looks hacky but it

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Chrome Dev Toolsが開かれてるかどうかをconsole.profileを使って判定する