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style: Add a note about weirdness in serialization of computed calc().

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Emilio Cobos Álvarez 2017-08-17 21:41:37 +02:00
parent e05c673df3
commit 1d54a8e857
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components/style/values/computed/length.rs
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@ -194,6 +194,18 @@ impl From<LengthOrPercentageOrNone> for Option<CalcLengthOrPercentage> {
impl ToCss for CalcLengthOrPercentage {
fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
// FIXME(emilio): This should be consistent with specified calc().
//
// Also, serialisation here is kinda weird with negative percentages,
// for example, as of right now:
//
// calc(10px - 5%)
//
// would serialize as:
//
// calc(10px + -5%)
//
// Need to update and run through try.
match (self.length, self.percentage) {
(l, Some(p)) if l == Au(0) => p.to_css(dest),
(l, Some(p)) => write!(dest, "calc({}px + {}%)", Au::to_px(l), p.0 * 100.),