In my application, I used ANGLE as graphics backend due to graphics compatibility. But I found that WebEngineView sometimes gets stuck, especially during successive keyborad inputting.

And I looked into this issue and got some findings. The stuck seams related to Qt Quick's refresh rate. Please see the following QML code snippets.

RowLayout {
    spacing: 10

    // when BusyIndicator is running, the stuck appears
    BusyIndicator {
        running: checkbox.checked
    }

    CheckBox {
        id: checkbox
        checked: true
        text: "BusyIndicator"
    }
}

WebEngineView {
    url: "qrc:/test.html"
}

If the BusyIndicator is running, the stuck appears while pressing buttons. If disabled, the stuck never appears.

The webpage is as follows.

<input type="text" style="width:400px;">

 Please try my attachment to reproduce it.