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docs(implement): drive T3 preview around hidden-tab, viewport and blur faults - #55
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…faults Rubens' PRD #16 verification on 2026-10-27 found clicks stalling in a tab that draws no frames, preview_resize reporting a width the page did not get, and blurred captures. PREVIEW.md now targets refs or CSS selectors, tells the two click-timeout causes apart, checks innerWidth, falls back to the browser CLI for blurred captures, and reads state with preview_evaluate. The trial entry in t3-dependencies.md records the faults. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Folds what T3's preview tools did while Rubens verified PRD #16's screens on 2026-10-27 (T3 desktop 0.1.4-nightly.20261027.3783) into
PREVIEW.md. The trial entry int3-dependencies.mdrecords the three new faults and adds clearing them to its "Would improve if".What
PREVIEW.mdnow tells an agent to do:scrollIntoViewIfNeededhas two causes that look the same: the target isn't there under that name, or the tab draws no frames. The fix for the second is to take a snapshot, which paints one, and click again.open: truedoesn't help.innerWidthwithpreview_evaluate, because thepreview_resizeresponse can report a size the page didn't get.preview_evaluate, which is far cheaper than a snapshot.Projects: every project that verifies UI in a T3 thread (Rubens, en-escena) drives the preview this way. None has to add or rename anything. The contract already requires
verification.md§ Drive to name a fallback.Review
Tier: readback, reviewed b4dc94c
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