[Name] fetchid [Required] false [Attribute Constraints] This attribute must not be specified in conjunction with the src attribute, otherwise ignored. [Default Value] none [Valid Values] valid fetch ID [Description] An ECMAScript expression which returns the fetch identifier of a completed fetch request, acquired either in a fetch with the fetchid attribute, or from the fetchid attribute of a fetch.done event. If the fetch identifier is invalid, has not completed, or the fetched content is not valid ECMAScript, an error.semantic event must be thrown. [Type] 
ECMAScript Expression
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