From 2dad1f0fd7bdca70acacb0c1e22e11ef2a54736c Mon Sep 17 00:00:00 2001
From: CanadaHonk <oj@oojmed.com>
Date: Mon, 13 Mar 2023 11:38:45 +0000
Subject: [PATCH] style: Infinity angles should degenerate compute to 0

Also adjusted WPT tests to always expect deg like similar past changes.

WPT tests: https://github.com/web-platform-tests/wpt/blob/master/css/css-values/calc-infinity-nan-computed.html#L57-L71

Differential Revision: https://phabricator.services.mozilla.com/D172401
---
 components/style/values/specified/angle.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/components/style/values/specified/angle.rs b/components/style/values/specified/angle.rs
index 7f6c1a9dca4..212aa5fb03b 100644
--- a/components/style/values/specified/angle.rs
+++ b/components/style/values/specified/angle.rs
@@ -114,7 +114,14 @@ impl ToComputedValue for Angle {
 
     #[inline]
     fn to_computed_value(&self, _context: &Context) -> Self::ComputedValue {
-        ComputedAngle::from_degrees(crate::values::normalize(self.degrees()))
+        let degrees = self.degrees();
+
+        // NaN and +-infinity should degenerate to 0: https://github.com/w3c/csswg-drafts/issues/6105
+        ComputedAngle::from_degrees(if degrees.is_finite() {
+            degrees
+        } else {
+            0.0
+        })
     }
 
     #[inline]