1815734 - window.onafterprint is called before print dialog closes

Status: RESOLVED DUPLICATE of bug 1663290

(Toolkit :: Printing, defect)

Description

[u721905]

Attachment: windowPrintEvents.html

Steps to reproduce:

Open the attached HTML and press Ctrl+P

Actual results:

"onafterprint" was logged to the console before the print dialog closed

Expected results:

"onafterprint" is logged to the console after the print dialog closes.

Comment 1

[u721905]

This is similar and perhaps related to https://bugzilla.mozilla.org/show_bug.cgi?id=1214805, but in this case the behavior does not depend on clicking Cancel vs Print in the print dialog.

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'DevTools::Console' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 3

[Nicolas Chevobbe [:nchevobbe]]

Not related to console, you can see the issue with data:text/html,<meta charset=utf8><script>window.onafterprint = () => document.body.style.background = "tomato"</script>Hello
The page will turn red before the page is printed

Comment 4

[Eric Fisher]

I am having the same issue using FF 109.0.1 (64bit) on macOS. Both the beforeprint and afterprint events fire when the print dialog opens. I would not expect the afterprint event to fire until the print dialog is dismissed (regardless of how it is dismissed).

Comment 6

[Mark Striemer [:mstriemer]]

For completeness bug 1663290 is where this could potentially change. Bug 1793627 states that this was a conscious decision and the afterprint event should fire when we've prepared the printing document, not to expose the user's interaction with the print dialog.