diff --git a/components/layout/display_list/mod.rs b/components/layout/display_list/mod.rs
index 83c249426ce..0db279cb10e 100644
--- a/components/layout/display_list/mod.rs
+++ b/components/layout/display_list/mod.rs
@@ -1553,13 +1553,19 @@ impl<'a> BuilderForBoxFragment<'a> {
         if width == 0.0 {
             return;
         }
-        let offset = outline
-            .outline_offset
-            .px()
-            .max(-self.border_rect.width() / 2.0)
-            .max(-self.border_rect.height() / 2.0) +
-            width;
-        let outline_rect = self.border_rect.inflate(offset, offset);
+        // <https://drafts.csswg.org/css-ui-3/#outline-offset>
+        // > Negative values must cause the outline to shrink into the border box. Both
+        // > the height and the width of outside of the shape drawn by the outline should
+        // > not become smaller than twice the computed value of the outline-width
+        // > property, to make sure that an outline can be rendered even with large
+        // > negative values. User agents should apply this constraint independently in
+        // > each dimension. If the outline is drawn as multiple disconnected shapes, this
+        // > constraint applies to each shape separately.
+        let offset = outline.outline_offset.px() + width;
+        let outline_rect = self.border_rect.inflate(
+            offset.max(-self.border_rect.width() / 2.0 + width),
+            offset.max(-self.border_rect.height() / 2.0 + width),
+        );
         let common = builder.common_properties(outline_rect, &self.fragment.style);
         let widths = SideOffsets2D::new_all_same(width);
         let border_style = match outline.outline_style {
diff --git a/tests/wpt/meta/css/css-ui/negative-outline-offset.html.ini b/tests/wpt/meta/css/css-ui/negative-outline-offset.html.ini
deleted file mode 100644
index 5883faa6763..00000000000
--- a/tests/wpt/meta/css/css-ui/negative-outline-offset.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[negative-outline-offset.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/css/css-ui/outline-014.html.ini b/tests/wpt/meta/css/css-ui/outline-014.html.ini
deleted file mode 100644
index 0069f95dc85..00000000000
--- a/tests/wpt/meta/css/css-ui/outline-014.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[outline-014.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/css/css-ui/outline-015.html.ini b/tests/wpt/meta/css/css-ui/outline-015.html.ini
deleted file mode 100644
index d49131e63f4..00000000000
--- a/tests/wpt/meta/css/css-ui/outline-015.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[outline-015.html]
-  expected: FAIL