According to the spec [1], atan2() should consume <dimension> that require resolving relative lengths. For example, `atan2(1em, 1px)`, and `atan2(1vw, 1wh)`. [1] https://www.w3.org/TR/css-values-4/#funcdef-atan2 crbug: https://crbug.com/1392594 FYR: https://chromium-review.googlesource.com/c/chromium/src/+/4004379/comment/5cee3216_d4a178ca/
<rdar://problem/103141582>
https://github.com/w3c/csswg-drafts/issues/8169