tree bc0b2e006e31dfe487b837254c527ea5a17cb6d3
parent 4da3ecb66a710165c2099605855f55e17c785af1
author Xiaocheng Hu <xiaochengh@chromium.org> 1650927884 +0000
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> 1650927884 +0000

[renderblocking] Dynamically inserted render-blocking stylesheets should not block scripts

This patch fixes a bug that adding `blocking=render` to script-inserted
stylesheets makes them script-blocking, which violates the spec as only
parser-inserted stylesheets can be script-blocking [1].

The fix idea is to add a new enum to PendingSheetType to represent
dynamic render-blocking sheets, so that we only block rendering but not
scripts or parser for this type.

This patch is also a preparation patch to allow unblocking rendering on
dynamic stylesheets by removing `blocking=render` [2]

[1] https://html.spec.whatwg.org/#contributes-a-script-blocking-style-sheet
[2] crrev.com/c/3601726

Bug: 1271296
Change-Id: I6eee34357ab034c802b3b022719427a1b3964c19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3601502
Reviewed-by: Yoav Weiss <yoavweiss@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/main@{#995849}