Apologies for the bother - I see now that while the mouse didn't move the document layout changed so that the mouse down occurred over the span but then the div expanded, moving the input and span down the screen, so that the same coordinate was over the input by the time the mouse up occurred. I will have to go back to the real case now to investigate further, there must be some other problem there.
Status: UNCONFIRMED → RESOLVED
Last Resolved: 3 years ago
Resolution: --- → INVALID
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