From e34cf4fba03e5eb005a2ac36e61b7606b0aca1af Mon Sep 17 00:00:00 2001
From: Matt Brubeck <mbrubeck@limpet.net>
Date: Mon, 15 May 2017 14:19:19 -0700
Subject: Fix containing block size for absolute root element

Fixes #16248.
---
 components/layout/block.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'components/layout')

diff --git a/components/layout/block.rs b/components/layout/block.rs
index 5e30c6f08ee..4da24dfebd0 100644
--- a/components/layout/block.rs
+++ b/components/layout/block.rs
@@ -657,7 +657,7 @@ impl BlockFlow {
     pub fn containing_block_size(&self, viewport_size: &Size2D<Au>, descendant: OpaqueFlow)
                                  -> LogicalSize<Au> {
         debug_assert!(self.base.flags.contains(IS_ABSOLUTELY_POSITIONED));
-        if self.is_fixed() {
+        if self.is_fixed() || self.is_root() {
             // Initial containing block is the CB for the root
             LogicalSize::from_physical(self.base.writing_mode, *viewport_size)
         } else {
-- 
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