All content will be re-rastered when its transform scale changes, iff it does not have the will-change: transform CSS property. In other words, `will-change: transform` means "please animate it fast". This only applies to transforms scales that happen via script manipulation, and does not apply to CSS animations. This means your site will likely get better-looking content, but it may also be slower without some simple changes outlined below.
Docs: https://docs.google.com/document/d/1f8WS99F9GORWP_m74l_JfsTHgCrHkbEorHYu72D4Xag/
Samples: https://googlechrome.github.io/samples/css-will-change-transform-rasterization/index.html