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LibWeb: Treat % max-height as none when containing block size indefinite

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Fixes #19371
This commit is contained in:
Andreas Kling 2023-06-14 15:33:06 +02:00
parent b6f3369b66
commit 43e1343abf
6 changed files with 101 additions and 5 deletions
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22
Userland/Libraries/LibWeb/Layout/FormattingContext.cpp
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@ -268,7 +268,7 @@ CSSPixelSize FormattingContext::solve_replaced_size_constraint(CSSPixels input_w
CSSPixels specified_min_width = box.computed_values().min_width().is_auto() ? 0 : box.computed_values().min_width().to_px(box, width_of_containing_block);
CSSPixels specified_max_width = box.computed_values().max_width().is_none() ? input_width : box.computed_values().max_width().to_px(box, width_of_containing_block);
CSSPixels specified_min_height = box.computed_values().min_height().is_auto() ? 0 : box.computed_values().min_height().to_px(box, height_of_containing_block);
CSSPixels specified_max_height = box.computed_values().max_height().is_none() ? input_height : box.computed_values().max_height().to_px(box, height_of_containing_block);
CSSPixels specified_max_height = should_treat_max_height_as_none(box) ? input_height : box.computed_values().max_height().to_px(box, height_of_containing_block);
auto min_width = min(specified_min_width, specified_max_width);
auto max_width = max(specified_min_width, specified_max_width);
@ -527,8 +527,8 @@ CSSPixels FormattingContext::compute_height_for_replaced_element(Box const& box,
// 2. If this tentative height is greater than 'max-height', the rules above are applied again,
// but this time using the value of 'max-height' as the computed value for 'height'.
auto computed_max_height = box.computed_values().max_height();
if (!computed_max_height.is_none()) {
if (!should_treat_max_height_as_none(box)) {
auto const& computed_max_height = box.computed_values().max_height();
if (used_height > computed_max_height.to_px(box, height_of_containing_block)) {
used_height = tentative_height_for_replaced_element(box, computed_max_height, available_space);
}
@ -1655,4 +1655,20 @@ bool box_is_sized_as_replaced_element(Box const& box)
return is<ReplacedBox>(box) || box.has_preferred_aspect_ratio();
}
bool FormattingContext::should_treat_max_height_as_none(Box const& box) const
{
// https://www.w3.org/TR/CSS22/visudet.html#min-max-heights
// If the height of the containing block is not specified explicitly (i.e., it depends on content height),
// and this element is not absolutely positioned, the percentage value is treated as '0' (for 'min-height')
// or 'none' (for 'max-height').
auto const& max_height = box.computed_values().max_height();
if (max_height.is_none())
return true;
if (box.is_absolutely_positioned())
return false;
if (max_height.contains_percentage() && !m_state.get(*box.non_anonymous_containing_block()).has_definite_height())
return true;
return false;
}
}