197486 2019-05-01 18:37:29 -0700 Responsive Design Mode doesn't simulate screen size 2023-04-11 17:14:46 -0700 1 1 1 Unclassified WebKit Web Inspector WebKit Nightly Build All All RESOLVED MOVED CanvaBug, InRadar P2 Normal --- 1 xidorn-webkit webkit-unassigned bfulgham inspector-bugzilla-changes karlcow pangle webkit-bug-importer oldest_to_newest 1532176 0 xidorn-webkit 2019-05-01 18:37:29 -0700 Some apps choose to use screen size (as opposed to viewport size) as a factor for their responsive design. Safari doesn't seem to simulate screen size (obtained via `window.screen`) when in Responsive Design Mode, which makes it hard to debug those web apps. Steps to reproduce: 1. open a website 2. click Develop / Enter Responsive Design Mode 3. click Develop / Show JavaScript Console 4. enter "screen" and enter Expected result: It should have a screen object with width and height for the device. Actual result: The screen object has the width and height of the current desktop screen. 1885582 1 webkit-bug-importer 2022-07-20 22:53:07 -0700 <rdar://problem/97361332> 1900438 2 pangle 2022-09-22 13:22:56 -0700 <rdar://44222660> 1948080 3 bfulgham 2023-04-11 17:14:46 -0700 The cause of this issue is in code outside of WebKit, so resolving as MOVED.