Sounds like it might be reserving space for the top status bar in a different orientation.
Either this is a weird device specific bug or perhaps the author of the post launched Safari in a different orientation on one of the devices and then rotated (and Safari cached a different "screen" size).
This is complete speculation and I don't have a device next to me to test, but the 20px difference suggests that it's referring to the black status bar at the top.
"This is a detector of how many tabs are open. On my iPad 3 it reports different values when I have more than one tap open, matching the reports on the screen captures. The iPad mini screen capture has two tabs open, while the iPad 2 capture has only one. My iPad 3 reports matching values when I have one or two tabs open. – Mr. Berna 12 mins ago"
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[ 3.2 ms ] story [ 33.3 ms ] threadIt feels like something that might be "fixed" in a future release.
Unless anyone knows of a specific reason why this should be the case?
Either this is a weird device specific bug or perhaps the author of the post launched Safari in a different orientation on one of the devices and then rotated (and Safari cached a different "screen" size).
This is complete speculation and I don't have a device next to me to test, but the 20px difference suggests that it's referring to the black status bar at the top.
Edit: looks like it might be related to tabs: http://stackoverflow.com/a/13380055/552710
I couldn't get it to change with the number of tabs open.
This is a screenshot from my iPad 2: http://i.imgur.com/eEzki.jpg
"This is a detector of how many tabs are open. On my iPad 3 it reports different values when I have more than one tap open, matching the reports on the screen captures. The iPad mini screen capture has two tabs open, while the iPad 2 capture has only one. My iPad 3 reports matching values when I have one or two tabs open. – Mr. Berna 12 mins ago"