Content may only scroll in one dimension (horizontal or vertical) at a width and height equivalent of 320x256 pixels or larger. Excluded is content where a two-dimensional layout is necessary (video, data tables, maps, diagrams)
Using the Chrome web inspector (F12), the easiest way to test for this criterion is to open the Responsive design preview menu. (![]) Within that menu, set the dimensions to a width of 320px and a height of 256px.
After setting those dimensions, ensure the entire page only scrolls in one direction (either horizontally or vertically). Only certain elements that require a two-dimensional layout are allowed to scroll in two directions. Examples include data tables, maps, and diagrams.
