diff options
| -rw-r--r-- | components/style/bloom.rs | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/components/style/bloom.rs b/components/style/bloom.rs index d3ed204fb1e..4dd880d8ea7 100644 --- a/components/style/bloom.rs +++ b/components/style/bloom.rs @@ -214,11 +214,25 @@ impl StyleBloom { // // Not-so-happy case: Parent's don't match, so we need to keep going up // until we find a common ancestor. + // + // Gecko currently models native anonymous content that conceptually hangs + // off the document (such as scrollbars) as a separate subtree from the + // document root. Thus it's possible with Gecko that we do not find any + // common ancestor. while *self.elements.last().unwrap() != common_parent.as_node().to_unsafe() { parents_to_insert.push(common_parent); - common_parent = - common_parent.parent_element().expect("We were lied again?"); self.pop::<E>().unwrap(); + common_parent = match common_parent.parent_element() { + Some(parent) => parent, + None => { + debug_assert!(self.elements.is_empty()); + if cfg!(feature = "gecko") { + break; + } else { + panic!("should have found a common ancestor"); + } + } + } } // Now the parents match, so insert the stack of elements we have been |