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LibWeb: Treat unresolvable percentage sizes as auto on replaced elements

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For replaced elements with percentage width or height, we were treating
them as 0 instead of auto when their containing block had an indefinite
corresponding size.

This produced incorrect layouts in various cases, and although I can't
actually find something about this exact scenario in specs, the new
behavior does match other browsers.
This commit is contained in:
Andreas Kling 2022-11-03 18:46:50 +01:00
parent db318aece0
commit 305cb8a5d1
Notes: sideshowbarker 2024-07-17 18:08:55 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/305cb8a5d1
1 changed files with 5 additions and 11 deletions
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16
Userland/Libraries/LibWeb/Layout/FormattingContext.cpp
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@ -387,7 +387,7 @@ float FormattingContext::tentative_width_for_replaced_element(LayoutState const&
return 0;
auto height_of_containing_block = CSS::Length::make_px(containing_block_height_for(box, state));
auto const& computed_height = box.computed_values().height();
auto computed_height = should_treat_height_as_auto(box, available_space) ? CSS::Size::make_auto() : box.computed_values().height();
float used_width = computed_width.resolved(box, CSS::Length::make_px(available_space.width.to_px())).to_px(box);
@ -457,7 +457,7 @@ float FormattingContext::compute_width_for_replaced_element(LayoutState const& s
if (margin_right.is_auto())
margin_right = zero_value;
auto computed_width = box.computed_values().width();
auto computed_width = should_treat_width_as_auto(box, available_space) ? CSS::Size::make_auto() : box.computed_values().width();
// 1. The tentative used width is calculated (without 'min-width' and 'max-width')
auto used_width = tentative_width_for_replaced_element(state, box, computed_width, available_space);
@ -487,15 +487,9 @@ float FormattingContext::compute_width_for_replaced_element(LayoutState const& s
// https://www.w3.org/TR/CSS22/visudet.html#inline-replaced-height
float FormattingContext::tentative_height_for_replaced_element(LayoutState const& state, ReplacedBox const& box, CSS::Size const& computed_height, AvailableSpace const& available_space)
{
// Treat percentages of indefinite containing block heights as 0 (the initial height).
if (computed_height.is_percentage() && !state.get(*box.containing_block()).has_definite_height())
return 0;
auto const& computed_width = box.computed_values().width();
// If 'height' and 'width' both have computed values of 'auto' and the element also has
// an intrinsic height, then that intrinsic height is the used value of 'height'.
if (computed_width.is_auto() && computed_height.is_auto() && box.has_intrinsic_height())
if (should_treat_width_as_auto(box, available_space) && should_treat_height_as_auto(box, available_space) && box.has_intrinsic_height())
return box.intrinsic_height().value();
// Otherwise, if 'height' has a computed value of 'auto', and the element has an intrinsic ratio then the used value of 'height' is:
@ -524,8 +518,8 @@ float FormattingContext::compute_height_for_replaced_element(LayoutState const&
auto width_of_containing_block_as_length = CSS::Length::make_px(available_space.width.to_px());
auto height_of_containing_block_as_length = CSS::Length::make_px(available_space.height.to_px());
auto computed_width = box.computed_values().width();
auto computed_height = box.computed_values().height();
auto computed_width = should_treat_width_as_auto(box, available_space) ? CSS::Size::make_auto() : box.computed_values().width();
auto computed_height = should_treat_height_as_auto(box, available_space) ? CSS::Size::make_auto() : box.computed_values().height();
float used_height = tentative_height_for_replaced_element(state, box, computed_height, available_space);