Yeah, we need to track whether any custom property uses viewport units, and either mark all elements with `USES_VIEWPORT_UNITS` or, most likely simpler, trigger a subtree recascade around [here](https://searchfox.org/mozilla-central/rev/5134f3f1c7794fcff1bde59dc7b4ae65cc460919/servo/components/style/invalidation/viewport_units.rs#31)...
Bug 1865810 Comment 1 Edit History
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Yeah, we need to track whether any custom property uses viewport units in its initial value, and either mark all elements with `USES_VIEWPORT_UNITS` or, most likely simpler, trigger a subtree recascade around [here](https://searchfox.org/mozilla-central/rev/5134f3f1c7794fcff1bde59dc7b4ae65cc460919/servo/components/style/invalidation/viewport_units.rs#31)...