html/template: fix escaping of URLs in meta content attributes The WHATWG "shared declarative refresh steps" algorithm (ยง4.2.5.3) skips ASCII whitespace between "url" and "=" when parsing the URL portion of a meta content attribute. Thank you to Samy Ghannad for reporting this issue. Updates #78913 Fixes CVE-2026-39823 Change-Id: I7fc3bb9394b95e07b9b10fbc95725a3de6791774 Reviewed-on: https://go-review.googlesource.com/c/go/+/769920 Reviewed-by: Roland Shoemaker <roland@golang.org> TryBot-Bypass: Roland Shoemaker <roland@golang.org>
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