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document updated 11 years ago, on Sep 15, 2011
See also: roundup of the state of the art in in-browser debugging across the major browsers.


view Javascript errorsTools > Error Console

more thorough debuggingFirebug

Internet Explorer

view Javascript errors — double-click on the exclamation-alert icon in the far lower-left corner

more thorough debugging


view Javascript errorsenable the develop menu, Page > Develop > Show Error Console

more thorough debuggingWeb Inspector


view Javascript errors — Page > Developer > JavaScript Console

more thorough debugging — Page icon > Developer > Debug JavaScript (it's text-only)


view Javascript errorsTools > Advanced > Error Console

more thorough debuggingDragonfly