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LibWeb: Don't use BFC auto height for non-BFC abspos elements

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While CSS 2.2 does tell us to use the "auto height for BFC roots"
calculation when resolving auto heights for abspos elements, that
doesn't make sense for other formatting context roots, e.g flex.

In lieu of implementing the entire new absolute positioning model from
CSS-POSITION-3, this patch borrows one small nugget from it: using
fit-content height as the auto height for non-BFC-root abspos elements.
This commit is contained in:
Andreas Kling 2023-06-20 13:20:08 +02:00
parent 38a6b7ad3d
commit c808f6c637
4 changed files with 58 additions and 15 deletions
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Userland/Libraries/LibWeb/Layout/FormattingContext.h
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@ -146,6 +146,8 @@ protected:
void compute_height_for_absolutely_positioned_non_replaced_element(Box const&, AvailableSpace const&, BeforeOrAfterInsideLayout);
void compute_height_for_absolutely_positioned_replaced_element(Box const&, AvailableSpace const&, BeforeOrAfterInsideLayout);
[[nodiscard]] Optional<CSSPixels> compute_auto_height_for_absolutely_positioned_element(Box const&, AvailableSpace const&, BeforeOrAfterInsideLayout) const;
Type m_type {};
FormattingContext* m_parent { nullptr };