WontFix: Chromium forcing its own title bar and borders on Linux
bugs.chromium.org
bugs.chromium.org
PWA = Progressive Web App
SSB refers to the ability to run a website inside its own window, like a native application. Also, it is expected to integrate into the desktop environment, with its own icon/shortcut.
PWA is more an umbrella term for websites using various technologies to close the gap between web and native applications (e.g. the ability to run offline). I would say it includes SSB (at least on desktop), among other things.
Latest Chromium from the Fedora repositories.
Adding an extra always-visible toolbar/address bar is the alternative, although wastes screen real estate for all users all the time.
Overall, I would say on balance breaking native toolbars is less damaging to the average user than wasting 60px always...
edit: Under Linux/BSD that is...
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I personally found this interesting, because I find it pretty cool that --apps are separated from the browser (I'd say not enough, since Alt-F -> X on the browser should not close them), but some users expect them to share behavior.