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style: expose methods to get ::before, ::after, and the other NAC.

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Reviewed-By: heycam
Bug: 1371130

MozReview-Commit-ID: JVeQevmjI3j
This commit is contained in:
Emilio Cobos Álvarez 2017-06-18 19:39:57 +02:00
parent a7ac9214f2
commit b894c361e0
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2 changed files with 74 additions and 0 deletions
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17
components/style/dom.rs
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@ -332,6 +332,23 @@ pub trait TElement : Eq + PartialEq + Debug + Hash + Sized + Copy + Clone +
self.parent_element()
}
/// The ::before pseudo-element of this element, if it exists.
fn before_pseudo_element(&self) -> Option<Self> {
None
}
/// The ::after pseudo-element of this element, if it exists.
fn after_pseudo_element(&self) -> Option<Self> {
None
}
/// Execute `f` for each anonymous content child (apart from ::before and
/// ::after) whose originating element is `self`.
fn each_anonymous_content_child<F>(&self, _f: F)
where
F: FnMut(Self),
{}
/// For a given NAC element, return the closest non-NAC ancestor, which is
/// guaranteed to exist.
fn closest_non_native_anonymous_ancestor(&self) -> Option<Self> {