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Add some comments to may_generate_pseudo; no real behavior changes for now.

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Gecko bug 1324618 part 2: https://bugzilla.mozilla.org/show_bug.cgi?id=1324618
This commit is contained in:
Boris Zbarsky 2017-06-26 23:24:08 -07:00
parent acb27de71c
commit 18ab0087ae
1 changed files with 11 additions and 1 deletions
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12
components/style/dom.rs
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@ -426,9 +426,19 @@ pub trait TElement : Eq + PartialEq + Debug + Hash + Sized + Copy + Clone +
/// TODO(emilio, bz): actually implement the logic for it.
fn may_generate_pseudo(
&self,
_pseudo: &PseudoElement,
pseudo: &PseudoElement,
_primary_style: &ComputedValues,
) -> bool {
// ::before/::after are always supported for now, though we could try to
// optimize out leaf elements.
// ::first-letter and ::first-line are only supported for block-inside
// things, and only in Gecko, not Servo. Unfortunately, Gecko has
// block-inside things that might have any computed display value due to
// things like fieldsets, legends, etc. Need to figure out how this
// should work.
debug_assert!(pseudo.is_eager(),
"Someone called may_generate_pseudo with a non-eager pseudo.");
true
}