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LibWeb: Lower the baseline of text with veritcal-align: sub

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This lowers the baseline of the given text by one fifth of the parent's
font size.
This commit is contained in:
Tim Ledbetter 2025-03-23 01:36:17 +00:00 • committed by Jelle Raaijmakers
parent 6fbbbc9b81
commit 7853b757c2
Notes: github-actions[bot] 2025-03-27 23:47:54 +00:00
1 changed files with 6 additions and 1 deletions
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7
Libraries/LibWeb/Layout/LineBuilder.cpp
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@ -327,6 +327,12 @@ void LineBuilder::update_last_line()
auto const x_height = CSSPixels::nearest_value_for(m_context.containing_block().first_available_font().pixel_metrics().x_height);
return m_current_block_offset + line_box_baseline + ((effective_box_top_offset - effective_box_bottom_offset - x_height - fragment.height()) / 2);
}
case CSS::VerticalAlign::Sub:
// https://drafts.csswg.org/css-inline/#valdef-baseline-shift-sub
// Lower by the offset appropriate for subscripts of the parent’s box.
// The UA may use the parent’s font metrics to find this offset; otherwise it defaults to dropping by one fifth of the parent’s used font-size.
// FIXME: Use font metrics to find a more appropriate offset, if possible
return alphabetic_baseline + m_context.containing_block().computed_values().font_size() / 5;
case CSS::VerticalAlign::Super:
// https://drafts.csswg.org/css-inline/#valdef-baseline-shift-super
// Raise by the offset appropriate for superscripts of the parent’s box.
@ -334,7 +340,6 @@ void LineBuilder::update_last_line()
// FIXME: Use font metrics to find a more appropriate offset, if possible
return alphabetic_baseline - m_context.containing_block().computed_values().font_size() / 3;
case CSS::VerticalAlign::Bottom:
case CSS::VerticalAlign::Sub:
case CSS::VerticalAlign::TextBottom:
case CSS::VerticalAlign::TextTop:
// FIXME: These are all 'baseline'