[Details] is an ECMAScript left-hand-side expression that is set to the fetch completion event. The specification of this attribute in a implies a blocking fetch, which will be executed synchronously. If this attribute is not specified, the fetch is asynchronous. [Attribute Name] 
synch
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