[release-branch.go1.21] html/template: support HTML-like comments in script contexts

Per Appendix B.1.1 of the ECMAScript specification, support HTML-like
comments in script contexts. Also per section 12.5, support hashbang
comments. This brings our parsing in-line with how browsers treat these
comment types.

Thanks to Takeshi Kaneko (GMO Cybersecurity by Ierae, Inc.) for
reporting this issue.

Fixes #62196
Fixes #62396
Fixes CVE-2023-39318

Change-Id: Id512702c5de3ae46cf648e268cb10e1eb392a181
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1976593
Run-TryBot: Roland Shoemaker <bracewell@google.com>
Reviewed-by: Tatiana Bradley <tatianabradley@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/2014618
Reviewed-on: https://go-review.googlesource.com/c/go/+/526096
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Cherry Mui <cherryyz@google.com>
5 files changed
tree: 4409b56fce5544b363cc9ad24e9ffdaa24994bb1
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
  17. VERSION
README.md

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