- From: Oriol Brufau via GitHub <sysbot+gh@w3.org>
- Date: Sun, 10 Jul 2022 19:21:56 +0000
- To: public-css-archive@w3.org
> Should 10vw be computed and converted into px? What if the terms were reversed? Should 10px be converted to vw then? It doesn't matter. `atan2(Y, X)` only depends on `Y / X` and the sign of `X`. So let's say `1vw = k * 1px`, where `k > 0`. Then `atan2(90px, 90vw)` can use `90px / (k * 90px) = 1 / k` and `sign(k * 90px) = 1`. Or it can use `(90vw / k) / 90vw = 1 / k` and `sign(90vw) = 1`. No difference. > If percentages are allowed, then what are they a percentage of? It depends. Percentages may have the type «[ "percent" → 1 ]» e.g. in `opacity`. Then you just use the ratio between the numerical parts of the percentages, and the sign. But in properties like `width`, where a percentage resolves into a length, the type is «[ "length" → 1 ]». So what you do is resolve the percentage as specified in the property (in `width`, against the width of the containing block), and then just do the division with the resulting length. > What should happen if a calculation cannot be simplified to a single number? See https://drafts.csswg.org/css-values-4/#calc-computed-value. Maybe not at specified value time, maybe not at computed value time either, but: "with used value time information, a [math function](https://drafts.csswg.org/css-values-4/#math-function) always simplifies down to a single numeric value." > why does this function accept units at all? Because it's more flexible and it's well-defined. Math functions that can accept dimensions do so: `min`, `max`, `clamp`, `round`, `mod`, `rem`, `hypot`, `abs`, `sign`. -- GitHub Notification of comment by Loirooriol Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/7482#issuecomment-1179783883 using your GitHub account -- Sent via github-notify-ml as configured in https://github.com/w3c/github-notify-ml-config
Received on Sunday, 10 July 2022 19:21:58 UTC