Web Performance

Resource timing as base (for Nav Timing)

<plh> https://github.com/w3c/navigation-timing/pull/36

<plh> https://w3c.github.io/navigation-timing/#sec-performance-navigation-types

plh: what should initiatorType returns for NT? null, empty string, something else?
... I'll keep it as an issue in the spec for now.

Slow-only frames, no composite, processing improvements (Frame Timing)

<ilya> https://github.com/w3c/frame-timing/pull/48

Ilya: I rewrote frame timing to only report slow frames

Future-proof the rIC API and make it extensible

<plh> https://github.com/w3c/requestidlecallback/issues/21

call Fetch to extract byte stream and content type (Beacon)

https://github.com/w3c/beacon/pull/11

<plh> " Specifications SHOULD only use USVString for APIs that perform text processing and need a string of Unicode scalar values to operate on. Most APIs that use strings should instead be using DOMString, which does not make any interpretations of the code units in the string. When in doubt, use DOMString. "

Size attributes: switch to unsigned long long and clarify TAO restrictions (Resource Timing)

-- https://github.com/w3c/resource-timing/pull/33

<plh> http://www.w3.org/TR/resource-timing/

Improve "initiator" reporting (Resource Timing)

-- https://github.com/w3c/resource-timing/issues/8

<plh> http://www.w3.org/TR/2015/WD-resource-timing-20150923/

<igrigorik> ai: add "preflight" and "fetch" to initiatorType

set visibilityState when prerendering (Resource Hints)

-- https://github.com/w3c/resource-hints/pull/42

Clarify perf observer registration process (Performance Timeline)

-- https://github.com/w3c/performance-timeline/pull/47