QWebView & QOpenGLwidget opacity issue

Antoine

Hi,

Context

I am using a QWebView in front of a QGLWidget.

The background of the QWebView is set to transparent, like this :

this->setStyleSheet("background-color: transparent;");
this->setWindowFlags(Qt::FramelessWindowHint); //No windowing
this->setAttribute(Qt::WA_TranslucentBackground); // No background

The background of the HTML page is also set to transparent in the CSS, like this :

body{
	background-color: rgba(255,255,255, 0) !important;
	background:transparent !important;
}

The need

I want to create a DIV on the left of the HTML page with a background semi-transparent, like this:
with the CSS property :

background: rgba(255, 255, 255, 0.61);

Normal result screenshot : Under Chrome

Here my issue:
When I am running the program, the background color is not set to white with a small opacity, here the result :

Issue result screenshot : In the app

I have tried this w/o any success :

QPalette palette = this->palette(); //Get webView palette
palette.setBrush(QPalette::Base, Qt::transparent);
this->page()->setPalette(palette); //Set transparent palette

this->setAutoFillBackground(false);
this->setAttribute(Qt::WA_OpaquePaintEvent, false);//Remove opaque

Please have you any idea how to manage this problem ?

Thank you in adavance