RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-31 13:38:11 +00:00
Code Issues Activity Actions

LibWeb: Include negative margins in height:auto computation for BFC root

Browse source 
...but never allow the resulting height to become negative. This solves
an issue seen on Acid3 where elements with negative vertical margins
expanded the size of their height:auto container instead of shrinking
it, which is the correct behavior. This now works :^)
This commit is contained in:
Andreas Kling 2022-03-26 22:45:51 +01:00
parent 0d9c28add9
commit 83a2aa1832
1 changed files with 4 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

10
Userland/Libraries/LibWeb/Layout/FormattingContext.cpp
View file

@ -286,9 +286,8 @@ float FormattingContext::compute_auto_height_for_block_formatting_context_root(F
auto const& child_box_state = state.get(child_box);
// FIXME: We're ignoring negative margins here, figure out the correct thing to do.
float child_box_top = child_box_state.offset.y() - child_box_state.border_box_top() - max(0, child_box_state.margin_top);
float child_box_bottom = child_box_state.offset.y() + child_box_state.content_height + child_box_state.border_box_bottom() + max(0, child_box_state.margin_bottom);
float child_box_top = child_box_state.offset.y() - child_box_state.margin_box_top();
float child_box_bottom = child_box_state.offset.y() + child_box_state.content_height + child_box_state.margin_box_bottom();
if (!top.has_value() || child_box_top < top.value())
top = child_box_top;
@ -308,8 +307,7 @@ float FormattingContext::compute_auto_height_for_block_formatting_context_root(F
return IterationDecision::Continue;
auto const& child_box_state = state.get(child_box);
// FIXME: We're ignoring negative margins here, figure out the correct thing to do.
float child_box_bottom = child_box_state.offset.y() + child_box_state.content_height + child_box_state.border_box_bottom() + max(0, child_box_state.margin_bottom);
float child_box_bottom = child_box_state.offset.y() + child_box_state.content_height + child_box_state.margin_box_bottom();
if (!bottom.has_value() || child_box_bottom > bottom.value())
bottom = child_box_bottom;
@ -317,7 +315,7 @@ float FormattingContext::compute_auto_height_for_block_formatting_context_root(F
return IterationDecision::Continue;
});
return bottom.value_or(0) - top.value_or(0);
return max(0, bottom.value_or(0) - top.value_or(0));
}
// 10.3.2 Inline, replaced elements, https://www.w3.org/TR/CSS22/visudet.html#inline-replaced-width