According to documentation (http://api.jquery.com/triggerHandler/) .triggerHandler should return value returned by event handler:

''Instead of returning the jQuery object (to allow chaining), .triggerHandler() returns whatever value was returned by the last handler it caused to be executed. If no handlers are triggered, it returns undefined.''

But when you add event handler using DOM0 method (onXY attribute), .triggerHandler returns 'undefined' everytime. Doesn't matter what you return from handler function.

Tested in browsers: Chrome/Firefox

jQuery version: 1.10 / 1.10.1

Test case: http://jsbin.com/atofap/3/edit

In console is:

click1

undefined

click2

false

Should be:

click1

false

click2

false