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layout: Use overflow: visible if overflow was propagated to viewport (#38598)

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The `overflow-*` values of either the root element or the `<body>` get
propagated to the viewport. However, we were missing this part:
> The element from which the value is propagated must then have a used
`overflow` value of `visible`.

See https://drafts.csswg.org/css-overflow/#overflow-propagation

Testing:
 - `css/cssom-view/scrolling-quirks-vs-nonquirks.html`
 - `css/css-overflow/overflow-body-propagation-007.html`
 - `css/css-overflow/overflow-body-propagation-008.html`
 - `css/css-overflow/overflow-body-propagation-009.html`
 - `css/css-overflow/scrollable-overflow-with-nested-elements-001.html` 
 - `css/css-overflow/scrollable-overflow-with-nested-elements-002.html` 
 - `css/css-overflow/scrollable-overflow-with-nested-elements-003.html`
 - `css/css-overflow/scrollable-overflow-with-nested-elements-004.html`
 - `css/css-overflow/scrollbar-gutter-scroll-into-view.html`

Failures:
 - `css/css-overflow/overflow-body-propagation-010.html`
   Failing because of missing support for `contain: paint`.
- `css/css-overflow/scrollable-overflow-with-nested-elements-005.html`
Failing because of wrong `data-expected-height`, but correct
`data-expected-scroll-height` which is core of this PR.
`data-expected-height` can be dealt separately.


Fixes: #38248

---------

Signed-off-by: Shubham Gupta <shubham13297@gmail.com>
Signed-off-by: Oriol Brufau <obrufau@igalia.com>
Co-authored-by: Oriol Brufau <obrufau@igalia.com>
This commit is contained in:
Shubham Gupta 2025-08-20 22:21:51 +08:00 • committed by GitHub
parent 37088aa4c3
commit d8ff9c7a08
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22 changed files with 373 additions and 72 deletions
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18
components/layout/taffy/mod.rs
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@ -21,6 +21,7 @@ use crate::dom::LayoutBox;
use crate::dom_traversal::{NodeAndStyleInfo, NonReplacedContents};
use crate::formatting_contexts::IndependentFormattingContext;
use crate::fragment_tree::Fragment;
use crate::layout_box_base::LayoutBoxBase;
use crate::positioned::{AbsolutelyPositionedBox, PositioningContext};
#[derive(Debug, MallocSizeOf)]
@ -146,13 +147,24 @@ impl TaffyItemBox {
}
}
pub(crate) fn fragments(&self) -> Vec<Fragment> {
pub(crate) fn with_base<T>(&self, callback: impl Fn(&LayoutBoxBase) -> T) -> T {
match self.taffy_level_box {
TaffyItemBoxInner::InFlowBox(ref independent_formatting_context) => {
independent_formatting_context.base.fragments()
callback(&independent_formatting_context.base)
},
TaffyItemBoxInner::OutOfFlowAbsolutelyPositionedBox(ref positioned_box) => {
positioned_box.borrow().context.base.fragments()
callback(&positioned_box.borrow().context.base)
},
}
}
pub(crate) fn with_base_mut<T>(&mut self, callback: impl Fn(&mut LayoutBoxBase) -> T) -> T {
match &mut self.taffy_level_box {
TaffyItemBoxInner::InFlowBox(independent_formatting_context) => {
callback(&mut independent_formatting_context.base)
},
TaffyItemBoxInner::OutOfFlowAbsolutelyPositionedBox(positioned_box) => {
callback(&mut positioned_box.borrow_mut().context.base)
},
}
}