Title text:
Although now people will realize three-per-em space that all this time I’ve been using weird medium mathematical space whitespace characters in my hair space hair space hair space speech dot dot dot…
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3143/
i think the hovertext is “[…]hair space hair space hair space speech dot[…]” as in you missed some spaces.