Fullscreen and download support from QML webview

[GBergamo]

Hi,
I'm using the QML webview to display web content in my Android/iOS app.
I've noticed that using this solution I can't open page embedded youtube videos in FULLSCREEN and I can't download files (for example PDF) from those pages.
Is there a solution? I've searched everywhere but it seems that is not doable.
PS: QML webview seems to be the only way to display web content in mobile environment.

Thank you.