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path: root/components/layout_2020/flexbox/layout.rs
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-rw-r--r--components/layout_2020/flexbox/layout.rs4
1 files changed, 3 insertions, 1 deletions
diff --git a/components/layout_2020/flexbox/layout.rs b/components/layout_2020/flexbox/layout.rs
index ef4793e4a4a..866c7e4a879 100644
--- a/components/layout_2020/flexbox/layout.rs
+++ b/components/layout_2020/flexbox/layout.rs
@@ -2512,7 +2512,9 @@ impl FlexItemBox {
.auto_is(|| {
let containing_block_inline_size_minus_pbm =
flex_context.containing_block.inline_size -
- padding_border_margin.padding_border_sums.inline;
+ padding_border_margin.padding_border_sums.inline -
+ padding_border_margin.margin.inline_start.auto_is(Au::zero) -
+ padding_border_margin.margin.inline_end.auto_is(Au::zero);
if item_with_auto_cross_size_stretches_to_container_size {
containing_block_inline_size_minus_pbm