Bug 195769

Summary: Active EventSource prevents window.print() from working in Safari 12
Product: WebKit Reporter: Daniel LeCheminant <danlec>
Component: PrintingAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal CC: thorton, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: Safari 12   
Hardware: Mac   
OS: macOS 10.13   
URL: https://jsfiddle.net/43ufcxkw/

Description Daniel LeCheminant 2019-03-14 15:06:46 PDT 
Repro:

1. Visit a site with an active event source, e.g. https://simpl.info/eventsource/
2. Run window.print() from the console

Expected:

Print dialog opens, or some indication that a print is being attempted

Actual:

Nothing happens

Related:

I expect this is also the cause of https://github.com/launchdarkly/js-client/issues/121
Comment 1 Daniel LeCheminant 2019-03-14 15:12:23 PDT 
If it's helpful, I have a simple repro at https://jsfiddle.net/43ufcxkw/

The print on that page works in Chrome 72, but does not work in Safari 12.
Comment 2 Daniel LeCheminant 2019-03-15 09:53:59 PDT 
As a workaround, document.execCommand('print') does appear to work in Safari.
Comment 3 Radar WebKit Bug Importer 2019-03-16 13:24:51 PDT 
<rdar://problem/48955771>