Warns you of horizontal scrollbars and helps you debug them.
- Monitors the page only when DevTools is open to avoid slowing sites while browsing casually
- All elements out of page are shown in a "Scroll Alert" pane under the Elements panel in DevTools and can be clicked to point the inspector to them
- Whenever overflow is detected, a warning appears in the DevTools console
- Elements extending beyond the browser window have red shadow and outline to be found easily