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fine vertical scrolling with keyboard

[kwin 5.8.7, up-to-date openSuSE Leap 42.3]


within an HTML browser I can easily scroll up and down with the arrow
keys which use, say, 100 pixels per keyboard press.  Is there a way to
have, say, 'Alt + Arrow Key' to move 10 pixels instead?  Ditto for
one-pixel moves?