diff options
Diffstat (limited to 'components/layout/fragment.rs')
| -rw-r--r-- | components/layout/fragment.rs | 30 |
1 files changed, 10 insertions, 20 deletions
diff --git a/components/layout/fragment.rs b/components/layout/fragment.rs index 23c8b4fda82..4e0763612ad 100644 --- a/components/layout/fragment.rs +++ b/components/layout/fragment.rs @@ -2526,27 +2526,17 @@ impl Fragment { return true } - match (self.style().get_box().position, - self.style().get_position().z_index, - self.style().get_box().overflow_x, - self.style().get_box().overflow_y) { - (position::T::absolute, - Either::Second(Auto), - overflow_x::T::visible, - overflow_x::T::visible) | - (position::T::fixed, - Either::Second(Auto), - overflow_x::T::visible, - overflow_x::T::visible) | - (position::T::relative, - Either::Second(Auto), - overflow_x::T::visible, - overflow_x::T::visible) => false, - (position::T::absolute, _, _, _) | - (position::T::fixed, _, _, _) | - (position::T::relative, _, _, _) => true, - (position::T::static_, _, _, _) => false + // Statically positioned fragments don't establish stacking contexts if the previous + // conditions are not fulfilled. Furthermore, z-index doesn't apply to statically + // positioned fragments. + if self.style().get_box().position == position::T::static_ { + return false; } + + // For absolutely and relatively positioned fragments we only establish a stacking + // context if there is a z-index set. + // See https://www.w3.org/TR/CSS2/visuren.html#z-index + self.style().get_position().z_index != Either::Second(Auto) } // Get the effective z-index of this fragment. Z-indices only apply to positioned element |