diff --git a/components/layout/fragment.rs b/components/layout/fragment.rs
index 392cc7f62e9..bf42f628f09 100644
--- a/components/layout/fragment.rs
+++ b/components/layout/fragment.rs
@@ -2380,10 +2380,7 @@ impl Fragment {
pub fn update_late_computed_replaced_inline_size_if_necessary(&mut self) {
if let SpecificFragmentInfo::InlineBlock(ref mut inline_block_info) = self.specific {
let block_flow = FlowRef::deref_mut(&mut inline_block_info.flow_ref).as_block();
- let margin = block_flow.fragment.style.logical_margin();
- self.border_box.size.inline = block_flow.fragment.border_box.size.inline +
- MaybeAuto::from_style(margin.inline_start, Au(0)).specified_or_zero() +
- MaybeAuto::from_style(margin.inline_end, Au(0)).specified_or_zero()
+ self.border_box.size.inline = block_flow.fragment.margin_box_inline_size();
}
}
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 3e7ec3422b6..2fb9a692943 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -2759,6 +2759,18 @@
{}
]
],
+ "css/inline_block_percentage_margin.html": [
+ [
+ "/_mozilla/css/inline_block_percentage_margin.html",
+ [
+ [
+ "/_mozilla/css/inline_block_percentage_margin_ref.html",
+ "=="
+ ]
+ ],
+ {}
+ ]
+ ],
"css/inline_block_stacking_context_a.html": [
[
"/_mozilla/css/inline_block_stacking_context_a.html",
@@ -7875,6 +7887,11 @@
{}
]
],
+ "css/inline_block_percentage_margin_ref.html": [
+ [
+ {}
+ ]
+ ],
"css/inline_block_stacking_context_ref.html": [
[
{}
@@ -21797,6 +21814,14 @@
"bad4704435c74a3204925206802eb004f380500e",
"support"
],
+ "css/inline_block_percentage_margin.html": [
+ "0b750acad3bcc6b5fabf9e625b6adf22e1e97640",
+ "reftest"
+ ],
+ "css/inline_block_percentage_margin_ref.html": [
+ "3726b3b2149b9e6584277fd33b77940d5f9d6800",
+ "support"
+ ],
"css/inline_block_stacking_context_a.html": [
"6c872ab3c551e4fe6c293468aa310ae61487b583",
"reftest"
diff --git a/tests/wpt/mozilla/tests/css/inline_block_percentage_margin.html b/tests/wpt/mozilla/tests/css/inline_block_percentage_margin.html
new file mode 100644
index 00000000000..83b2b8a88a2
--- /dev/null
+++ b/tests/wpt/mozilla/tests/css/inline_block_percentage_margin.html
@@ -0,0 +1,16 @@
+
+
+
+
+
diff --git a/tests/wpt/mozilla/tests/css/inline_block_percentage_margin_ref.html b/tests/wpt/mozilla/tests/css/inline_block_percentage_margin_ref.html
new file mode 100644
index 00000000000..3a51b7a1ac5
--- /dev/null
+++ b/tests/wpt/mozilla/tests/css/inline_block_percentage_margin_ref.html
@@ -0,0 +1,15 @@
+
+
+
+