Zachary D. Rowitsch eb9f99f54c Implement -webkit-center for <center> element block centering ...

Add TextAlign::WebkitCenter variant that centers both inline text and
block-level children narrower than their container. The UA stylesheet
now uses -webkit-center for <center>, matching real browser behavior
where block children (like tables) are centered, not just inline text.

The core mechanism is a post-layout shift in layout_block_children_vertical
that repositions block children by (container_width - child_width) / 2.
The shift_subtree_x helper recursively adjusts content origins, inline
line boxes/fragments, and collapsed border segments. Guards prevent
double-centering (auto-margin children), shifting table internals, and
incorrectly shifting absolutely/fixed-positioned descendants.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-26 15:16:14 -05:00

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