diff --git a/components/layout/taffy/layout.rs b/components/layout/taffy/layout.rs
index 12d47947fc5..c5f66eee6d2 100644
--- a/components/layout/taffy/layout.rs
+++ b/components/layout/taffy/layout.rs
@@ -320,6 +320,7 @@ impl taffy::LayoutGridContainer for TaffyContainerContext<'_> {
     ) -> Self::GridItemStyle<'_> {
         let id = usize::from(child_node_id);
         let child = (*self.source_child_nodes[id]).borrow();
+        // TODO: account for non-replaced elements that are "compressible replaced"
         let is_replaced = child.is_in_flow_replaced();
         let stylo_style = AtomicRef::map(child, |c| &*c.style);
         TaffyStyloStyle::new(stylo_style, is_replaced)
diff --git a/components/layout/taffy/stylo_taffy/convert.rs b/components/layout/taffy/stylo_taffy/convert.rs
index f45a705148d..6ac2e983602 100644
--- a/components/layout/taffy/stylo_taffy/convert.rs
+++ b/components/layout/taffy/stylo_taffy/convert.rs
@@ -41,7 +41,7 @@ pub fn length_percentage(val: &stylo::LengthPercentage) -> taffy::LengthPercenta
     match val.unpack() {
         stylo::UnpackedLengthPercentage::Length(len) => length(len.px()),
         stylo::UnpackedLengthPercentage::Percentage(percentage) => percent(percentage.0),
-        stylo::UnpackedLengthPercentage::Calc(_) => length(0.0),
+        stylo::UnpackedLengthPercentage::Calc(_) => percent(0.0),
     }
 }