If you specify this property in your stylesheet: -moz-transition-delay: 0, 10s; Firefox logs an error 'Error in parsing value for '-moz-transition-delay'. Declaration dropped.' To get it to work you need to add the units to the zero value: -moz-transition-delay: 0s, 10s; This is unlike any other browser's implementation of -*-transition-delay and also unlike other CSS rules where the units can be dropped if the value is zero.
The rule that the unit is optional only for zero lengths. See http://www.w3.org/TR/css3-values/#values
Let's dup this against a very similar bug
Status: UNCONFIRMED → RESOLVED
Last Resolved: 7 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 653999
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