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No horizontal scroll
Assert that the page has no horizontal scroll (scrollWidth ≤ clientWidth). Catches mobile-layout breakage.
Usage example
Make sure the page has no horizontal scrolling —
document.scrollWidth does not exceed clientWidth
(1px tolerance allowed).
No fields required.
The most common cause is a fixed pixel width on a banner/table that does not fit the mobile viewport. The error message will show how many pixels wider than the window the content is.