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marquee scroll speed (#124731)

This may be a proprietary, non-standard element, but since Opera has implemented it, they really should get it right.

marquee speeds are incorrectly implemented. If truespeed is not specified, scrolldelay should be limited to a minimum value of 60. Opera gets this wrong as shown in examples 3, 5 and 7 below which should have the same scroll speed as examples 1 and 2.

Opera also appears to set it's own minimum value of 40 to scrolldelay no matter the setting of truespeed, which results in example 8 not scrolling fast enough.

scrolldelay=60
scrolldelay=60 truespeed
scrolldelay=41
scrolldelay=40
scrolldelay=1
_SLOW_ _SLOW_ _SLOW_ _SLOW_ _SLOW_ _SLOW_ _SLOW_ _SLOW_ _SLOW_ _SLOW_ _SLOW_ _SLOW_ _SLOW_ _SLOW_ _SLOW_ This is intended to show that Opera treats scrolldelay values 1 through 40 the same, but 41 is slightly different. All five lines should be scrolling at the same speed as the first line.
scrolldelay=41 truespeed
scrolldelay=40 truespeed
MEDIUM MEDIUM MEDIUM MEDIUM MEDIUM MEDIUM
scrolldelay=1 truespeed _FAST_ _FAST_ _FAST_

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