Displaying an ellipsis on the last visible line of a block that overflows vertically

I've had two requests for this just in the last week.

Seems to me it would be easy to add a 'text-overflow-last' property with
the same values as text-overflow. When a block has text-overflow-last not
'clip', and its 'overflow' is not 'visible', and it has one or more lines
overflowing vertically, the last line that fully fits in the block (or the
first line, if there is no line that fully fits in the block) gets an
overflow indicator according to the value of 'text-overflow-last' and the
content of any later lines is hidden as if they're clipped out. If a line
gets a text-overflow-last indicator, it cannot also get a text-overflow
indicator.

Rob
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