android - Why webView.getContentHeight() < webView.computeVerticalScrollRange()? -

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i'm working webview , i've come across unexpected behaviour: webview's vertical scroll range higher content height. values debugger:

getcontentheight()               5123 computeverticalscrollrange()     6820

how possible?

the following expect true: 

verticalscrollrange + webviewheight = contentheight

why webview not in accordance this?

computeverticalscrollrange() uses arbitrary units in docs. there no guarantee match other units such pixels.


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