This feature is experimental. Please share your experiences so we know what to keep or change.
Returns the ETag of the content in the given element.
The ETag corresponds to the ETag
header
in the response that rendered the fragment. Alternatively the [up-etag]
attribute of the element
or an ancestor is used.
When the fragment is reloaded,
its ETag is sent as an If-None-Match
request header. The server may check the header and decide to skip rendering.
See Conditional requests for a full example.
The fragment's ETag.
Return undefined
if the fragment was rendered without an ETag.