how to obtain the width & height of the client area

Hello

Is there a way of knowing what is the widht & height of the client area portion of the browser that is currently viewed by the user?

If the user resizes the window, the width & height should update to reflect the change.

So if the user resizes the screen and makes it tiny, the width and height that I will get will be very small accordingly.

Similarly, is there a way of knowing what is the position (in pixels) of the currently-visible top-left corner of the client area?
Example: If both scrollbars are all the way to the left/top, the position should be (0,0). If the user scrolls to the right by 5 pixels, the position should be (5,0)…

thanks in advance

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