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@@ -48,6 +48,15 @@ CSSPixels BlockFormattingContext::automatic_content_height() const
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return compute_auto_height_for_block_formatting_context_root(root());
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}
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+static bool margins_collapse_through(Box const& box, LayoutState& state)
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+{
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+ // FIXME: A box's own margins collapse if the 'min-height' property is zero, and it has neither top or bottom borders
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+ // nor top or bottom padding, and it has a 'height' of either 0 or 'auto', and it does not contain a line box, and
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+ // all of its in-flow children's margins (if any) collapse.
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+ // https://www.w3.org/TR/CSS22/box.html#collapsing-margins
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+ return state.get(box).border_box_height() == 0;
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+}
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+
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void BlockFormattingContext::run(Box const&, LayoutMode layout_mode, AvailableSpace const& available_space)
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{
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if (is<Viewport>(root())) {
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@@ -65,6 +74,8 @@ void BlockFormattingContext::run(Box const&, LayoutMode layout_mode, AvailableSp
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for (auto* child_box = root().last_child_of_type<Box>(); child_box; child_box = child_box->previous_sibling_of_type<Box>()) {
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if (child_box->is_absolutely_positioned() || child_box->is_floating())
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continue;
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+ if (margins_collapse_through(*child_box, m_state))
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+ continue;
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m_state.get_mutable(*child_box).margin_bottom = m_margin_state.current_collapsed_margin().value();
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break;
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}
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@@ -379,15 +390,6 @@ void BlockFormattingContext::layout_inline_children(BlockContainer const& block_
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block_container_state.set_content_height(context.automatic_content_height());
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}
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-static bool margins_collapse_through(Box const& box, LayoutState& state)
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-{
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- // FIXME: A box's own margins collapse if the 'min-height' property is zero, and it has neither top or bottom borders
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- // nor top or bottom padding, and it has a 'height' of either 0 or 'auto', and it does not contain a line box, and
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- // all of its in-flow children's margins (if any) collapse.
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- // https://www.w3.org/TR/CSS22/box.html#collapsing-margins
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- return state.get(box).border_box_height() == 0;
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-}
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-
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CSSPixels BlockFormattingContext::compute_auto_height_for_block_level_element(Box const& box, AvailableSpace const& available_space)
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{
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if (creates_block_formatting_context(box)) {
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Aliaksandr Kalenik