Simon Willison’s Weblog

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19th February 2026

Research Header Alignment Investigation - simonwillison.net — Addressing a subtle header alignment issue on simonwillison.net, this investigation tracked down a persistent ~1px height mismatch between left and right headers caused by anchor elements generating taller inline boxes than plain text due to font metrics. Multiple fixes—including removing position:relative/top:1px hacks and setting explicit heights—proved fragile.
Posted 19th February 2026 at 9:56 pm

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