[render-blocking] The links of "render-blocking" in fetch are vague

[cathiechen]

What is the issue with the Fetch Standard?

I found the links of "render-blocking" in fetch are vague when walking through the spec.

1. It shows "Possible linking syntaxes", when clicking https://fetch.spec.whatwg.org/#request-render-blocking
2. The value of "render-blocking" of "fetch timing info" is not used anywhere. https://fetch.spec.whatwg.org/#fetch-timing-info-render-blocking
   Should we make it clear?
   @xiaochengh @emilio

[xiaochengh]

It's supposed to be used in PerformanceResourceTiming, but the interlinks seem missing.

See #1449 and w3c/resource-timing#327

[cathiechen]

Ah, I see, thanks for explaining:)