Replying to @Kseso @csswg @frivoal
It was also in (& motivated by) w3.org/TR/2008/CR-css3-marqu… , which was dropped when pre-smartphone mobile Web went away

Jan 18, 2017 · 5:50 PM UTC

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Replying to @davidbaron
That's good archeology and better mining ;-) Thanks @frivoal