Intersection Observer review

[LJWatson]

The WebPlat WG has just published the FPWD of Intersection Observer, triggering wide review. Thanks to its time in incubation, the spec already has good interop, so we're hopeful of moving to CR reasonably quickly.

We'd welcome a review by the WebAppSec WG if possible. Feedback no later than Friday 27th October would be appreciated, feedback earlier even more so.

Please file issues on the Intersection Observer repo.

If this request is better made through another channel, please let me know. Thank you.