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Use the following html:
<body style="nowrap: true" scroll='auto'>this is a test of a very long line of things to write that goes on beyond the screen</body>
Note the nowrap which is important. Now, set the caret at the start of the line and press [Enter]. You will notice that the line moved down but the portion of it above the "hidden" scrollbar remained! It will be repainted on window hide/show etc. almost the same with "scroll: no/yes" but the "garbage" area is thinner.
I haven't found any references to the bug using google.