Yeah that could be. Plenty of issues could cause it (though I am using KWin as compositor). Maybe it's fixed by now, or just a glitch on my end.
EDIT: This is weird. My monitor has different modes including sRGB. I had it in a gaming mode (higher contrast, etc...) and it shows then, but in sRGB it doesn't show.
I took screenshots and when viewing there, regardless of screen mode, it's rendering fine, so clearly it must be a monitor issue of some sort. Odd that it would render in every non-sRGB mode, but be fine in sRGB.
Messing more with it, it seems to be related to the combo of sRGB being less bright/contrast than the non-sRGB modes, thus not enough to see the dots...
Zooming in (ctrl-wheelup) on the page causes it to disappear after the dots scale to the next size. Friend pointed out I can disable and test the css, which I did. I scaled to 2, and it's gone. So it's a scaling issue.
Then tried Vivaldi, same thing, turns out, it's gotta be a scaling issue with KDE/Kwin. It also only does it with 1440, not on 1080 (or 900, which I also tested). They're all 16:9 so it must not be a fractional scaling issue, maybe density just gets weird or it's the monitor in combo.
I have no idea whey I'm sharing just found it interesting in case anyone else wonders or notices.
Stuff like this always ends up being way more complicated to my than I initially expect! In a certain sense, we're a bit spoiled by how all of these complex pieces do actually work the way they're intended most of the time, which makes it easy to forget just how many layers there are.
I was also on a 2560x1440 monitor, and I had 1.5x scaling configured. I doubt I would have even thought of suggesting you check what mode you monitor was in even if I was on my desktop rather than my laptop.
> I have no idea whey I'm sharing just found it interesting in case anyone else wonders or notices.
I actually really like that you've followed up with all of the new details you found! I've been on the other side of stuff like this enough to appreciate when the DenverCoder9's of the world share their wisdom: https://xkcd.com/979/
EDIT: This is weird. My monitor has different modes including sRGB. I had it in a gaming mode (higher contrast, etc...) and it shows then, but in sRGB it doesn't show.
I took screenshots and when viewing there, regardless of screen mode, it's rendering fine, so clearly it must be a monitor issue of some sort. Odd that it would render in every non-sRGB mode, but be fine in sRGB.