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jQuery UI (Tabs, Dialog, etc.):Use the ​jQuery UI bug tracker.

jQuery Mobile: Use ​jQuery Mobile GitHub tracker.

jQuery plugins: Report your bug to its author, not here.

jQuery core bugs only: Follow these instructions.

• ​Search for existing similar tickets.
• Create a minimal test case on ​jsfiddle.net or ​jsbin.com demonstrating the issue. Remember that the team only supports the most recent versions; do not report a bug against version 1.7.2 for example.
• Read ​How to Report Bugs before pressing Create Ticket.