Is there any browser that currently supports accessing trailers in an HTTP/2 response?
For example, the latest Fetch API specs mention that trailers are exposed via Response.trailer. Is there a browser that supports that?
You can find a test case at http://wpt.fyi/fetch/api/response. See the results row for the test file response-trailer.html, and see also http://wpt.fyi/fetch/api/response/response-trailer.html.
Based on those results and their failure messages, it looks like there aren’t any browser engines that currently support Response.trailer.
But there are open browser feature bugs for it which you might want to follow: