[Required] false [Attribute Constraints] This attribute must not be specified in conjunction with the src attribute. attribute , otherwise ignored . [Type] ECMAScript Expression [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. [Name] 
fetchid
s r c
f e t c h i d
t i m e o u t
m a x a g e
m a x s t a l e
c h a r s e t