Contain wide tables within the document viewport

[masnwilliams]

summary

• make wide document tables independently horizontally scrollable
• prevent table content from widening the full document viewport
• cover the injected viewer style with a regression test

testing

• npm test
• npm run build
• Chromium smoke test confirmed the page scroll width stays at the viewport while the table has its own larger scroll width

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Note

Low Risk
CSS-only change in the doc overlay with a string assertion test; no auth, data, or API impact.

Overview
Wide markdown tables no longer stretch the document viewer’s page width. The sandbox overlay injects a table{display:block;max-width:100%;overflow-x:auto} rule ahead of the existing highlight styles in ensureStyle(), so each table scrolls horizontally inside the viewport instead of widening the whole doc.

A Vitest regression in overlay.test.ts asserts that OVERLAY_SCRIPT still includes that rule.

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Project	Deployment	Actions	Updated (UTC)
justhtml	Ready	Preview	Aug 29, 2026 3:49pm