size-adjust

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DebugSwiftHQ / fallback-font-check

Measure your fallback font against your webfont on real pages, per weight band, and get the size-adjust that stops text re-wrapping (CLS) when the font loads.

cli fonts web-performance cls font-display playwright core-web-vitals cumulative-layout-shift size-adjust

Updated Oct 9, 2026
JavaScript

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