[Webkit-unassigned] [Bug 204615] New: Sandbox flags should be snapshotted at start of navigation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=204615

            Bug ID: 204615
           Summary: Sandbox flags should be snapshotted at start of
                    navigation
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: iclelland at chromium.org

Document sandboxing flags should come from the state of the iframe container as the navigation starts. See recent HTML spec change at https://github.com/whatwg/html/pull/5098.

There are web platform tests as well, under review at https://github.com/web-platform-tests/wpt/pull/20411 -- Current results are available at https://wpt.fyi/results/html/browsers/sandboxing?label=pr_head&max-count=1&pr=20411

As far as I can tell, Safari's current behavior on those tests is:

* sandbox-navigation-timing: Fails because final document is sandboxed.
* sandbox-navigation-timing-2: Fails because final document has allow-same-origin.
* sandbox-navigation-timing-3: Fails (times out) because final document does not allow scripts.

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