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Bug
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    Resolution: Done
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P3: Somewhat important
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    5.13.1
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    None
 
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        3d1e71549b61db00ac06a4621d787e9454bcd4c0 (qt/qtwebengine/5.13)
 
From: https://doc.qt.io/qt-5/qml-qtwebengine-webenginesettings.html
| fullscreenSupportEnabled : bool | 
Tells the web engine whether fullscreen is supported in this application or not.
Enabled by default.
This property was introduced in QtWebEngine 1.2.
From:
https://doc.qt.io/qt-5/qwebenginesettings.html
| QWebEngineSettings::FullScreenSupportEnabled | 
| Enables fullscreen support in an application. Disabled by default. (Added in Qt 5.6) | 
Specifically, whether or not the option is enabled by default is inconsistent. I haven't tested to see which is correct, nor have I evaluated all the other options to see if there are other issues.