Recently, https://garden.bradwoods.io/notes/css/blend-modes https://garden.bradwoods.io/notes/css/blend-modes was linked to, which, using Firefox on Android, ta

Recently, https://garden.bradwoods.io/notes/css/blend-modes https://garden.bradwoods.io/notes/css/blend-modes was linked to, which, using Firefox on Android, takes hundreds of milliseconds to paint the new screen whenever I scroll. I can also notice the behavior on my desktop if I scroll quickly enough, even if I disable JavaScript. So it most likely has to do with an advanced CSS feature, perhaps the blend modes it is showcasing.