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IE and Edge, Chrome / Opera and Safari support the property but there is no standard definition of how it should behave. Example about a bug inquiring about the behavior: https://crbug.com/549809
Are there any statistics on how popular this property is with values other than '1' (which was used in the olden days to work around an IE6-7 hasLayout bug) ?
This doesn't answer the question but Blink measure the usage of 'zoom'. There has been a definite downwards trend over the past years: https://www.chromestatus.com/metrics/css/timeline/popularity/19 Unfortunately we don't have a more specialized counter for the value but we could track the used value fairly easily (I don't think we could hook into the parser easily though).