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script: Calculate proper border box for resizeobserver (#38988)

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Implements more of calculate_box_size, ensuring that the proper
rectangle is returned when the border box is requested.

Testing: WPT
Fixes: Partially #38811

---------

Signed-off-by: Ashwin Naren <arihant2math@gmail.com>
Co-authored-by: Jo Steven Novaryo <65610990+stevennovaryo@users.noreply.github.com>
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Ashwin Naren 2025-09-03 05:16:20 -07:00 • committed by GitHub
parent 433a461044
commit 4ea714e6d2
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2 changed files with 34 additions and 7 deletions
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13
components/script/dom/resizeobserver.rs
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@ -311,11 +311,18 @@ fn calculate_box_size(target: &Element, observed_box: &ResizeObserverBoxOptions)
// but the spec will expand to cover all fragments.
target
.upcast::<Node>()
.border_boxes()
.pop()
.content_box()
.unwrap_or_else(Rect::zero)
},
// TODO(#31182): add support for border box, and device pixel size, calculations.
ResizeObserverBoxOptions::Border_box => {
// Note: only taking first fragment,
// but the spec will expand to cover all fragments.
target
.upcast::<Node>()
.border_box()
.unwrap_or_else(Rect::zero)
},
// TODO(#31182): add support for device pixel size calculations.
_ => Rect::zero(),
}
}