According to https://github.com/DeveloperToolsWG/console-object/blob/master/api.md#consoleassertexpression-object: > console.assert(expression, object) > If the specified expression is false, the message is written to the console along with a stack trace. Right now, there is no trace provided alongside the logged object. Here is a test case: http://jsfiddle.net/bgrins/pBc5S/. STR: * Call console.assert(false, "Console assertion is false") Expected: * "Console assertion is false" is printed to the console, along with a stack trace Actual * "Console assertion is false" is printed to the console, but no stack trace is included

Thanks for the report! We have some bugs about adding stack traces to various messages: bug 920116 and bug 814497.

console.assert has had a stack since bug 920116 landed, I believe.