[Details] is an ECMAScript left-hand-side expression which receives an internally generated unique string identifier to be associated with the completion event. This identifier can be tested by the fetch completion event handler to distinguish among several outstanding fetch requests. If this attribute is not specified, the fetch ID can be acquired from the fetch completion event. Every fetch request will receive a unique fetch ID, even requests for the same document. [Attribute Name] 
fetchid
n e x t
n a m e l i s t
m e t h o d
f e t c h i d
s y n c h
t i m e o u t