Import wpt@87986b1b4f79e991b7867278e5a1bf23423a652a

Using wpt-import in Chromium e8b949a46439a97a1ed092e89663bd05b382f8e9.
With Chromium commits locally applied on WPT:
5f5c2cfe76 "Add post content type for form submission"
740ff89643 "ORB: Signal blocked resources by injecting a network error."


Note to sheriffs: This CL imports external tests and adds
expectations for those tests; if this CL is large and causes
a few new failures, please fix the failures by adding new
lines to TestExpectations rather than reverting. See:
https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md

Directory owners for changes in this CL:
cbiesinger@chromium.org:
  external/wpt/css/css-sizing
rego@igalia.com:
  external/wpt/css/css-contain
yhirano@chromium.org, mkwst@chromium.org, japhet@chromium.org:
  external/wpt/fetch
yosin@chromium.org, pcupp@microsoft.com:
  external/wpt/editing

NOAUTOREVERT=true
R=rubber-stamper@appspot.gserviceaccount.com

No-Export: true
Cq-Include-Trybots: luci.chromium.try:linux-wpt-identity-fyi-rel,linux-wpt-input-fyi-rel,linux-blink-rel
Change-Id: I0c6a2c386e116013b853b9cdf73bf62a88aeda02
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3899190
Auto-Submit: WPT Autoroller <wpt-autoroller@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1048340}