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-rw-r--r--components/layout/model.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/components/layout/model.rs b/components/layout/model.rs
index 8ee98a39678..f49ac51ad21 100644
--- a/components/layout/model.rs
+++ b/components/layout/model.rs
@@ -411,6 +411,8 @@ pub fn specified_or_none(length: LengthOrPercentageOrNone, containing_length: Au
match length {
LengthOrPercentageOrNone::None => None,
LengthOrPercentageOrNone::Percentage(percent) => Some(containing_length.scale_by(percent)),
+ LengthOrPercentageOrNone::Calc(calc) =>
+ Some(containing_length.scale_by(calc.percentage()) + calc.length()),
LengthOrPercentageOrNone::Length(length) => Some(length),
}
}