[Required] false [Attribute Constraints] This attribute is only valid in conjunction with the src attribute, otherwise ignored. [Type] Character string [Default Value] none [Valid Values] A valid time value for the HTTP 1.1 request [RFC2616] [Description] The character string must be interpreted as a time interval. This indicates that the document is willing to use content whose age must be no greater than the specified time in seconds (cf. 'max-age' in HTTP 1.1 [RFC2616]). The document is not willing to use stale content, unless maxstale is also provided. [Name] 
maxage
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