Chrome Version:  61.0.3132.0 (Developer Build) unknown (64-bit)
OS: Linux (presumably all)

What steps will reproduce the problem?
Call chrome.tabCapture.captureOffscreenTab with a document that calls window.print()

E.g. Run the demo here, start a presentation and send the 'print' message

https://github.com/mfoltzgoogle/samples/tree/temp-test-navigation/presentation-api

What is the expected result?
It's a no-op.

What happens instead?
Offscreen tab is blocked by a modal dialog that the user can't respond to.

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Notes:

- Presentations started with offscreen tabs should not respond to window.print() per spec; the sandboxed modals flag prevents this but it would be good to add secondary enforcement in the implementation.

- I don't see a way to prevent window.print() from spawning modal dialogs this way via WebContentsDelegate.  This is either a bug in ShouldSuppressDialogs, or requires plumbing a new API. :-/





What happens instead?

Please use labels and text to provide additional information.


For graphics-related bugs, please copy/paste the contents of the about:gpu
page at the end of this report.