NEW216395
"display-mode: fullscreen" media query should match in fullscreen browser windows 
https://bugs.webkit.org/show_bug.cgi?id=216395
Summary "display-mode: fullscreen" media query should match in fullscreen browser win...
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Radar WebKit Bug Importer
Comment 1 2020-09-10 19:36:56 PDT
<rdar://problem/68680815>
Johan Brook
Comment 2 2023-01-18 00:37:49 PST
We're having a real problem of not being able to distinguish macOS fullscreen mode from normal a "maximised" browser window. We've tried various techniques of measuring the window width/height and comparing with window.screen values, but it yields inconsistent results for laptop and external monitor screens. Ideally, the test below (http://output.jsbin.com/sizejuw/quiet) would say "Fullscreen: Yes" when a Safari window is put in macOS fullscreen mode. That CSS Media Query could also be used from Javascript. Second best, there'd be a Javascript API in the Fullscreen API spec for this (the existing APIs only seem to concern themselves with putting specific elements into fullscreen – not the window itself).
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