Input position relative to canvas in webgl

Hi,
In the examples InputSystem::GetInputPosition() is used to get the position of the mouse. In webgl that position given is relative to the browser page, but we would need to have the mouse position in the canvas coordinates instead for the cases where the canvas is not fullscreen.

In the example attached, P0 at the bottom left of the canvas should be (0;0) but it's (100;-100) and P1 should be (300;300) but it's (400;200), so basically the position of the canvas inside the page is not taken into account.

Thanks for your help!
Anthony