Keyboard (No Exception)
All functionality of the content is operable through a keyboard interface without requiring specific timings for individual keystrokes.
What it requires
WCAG 2.0 SC 2.1.3 (AAA) is 2.1.1 minus the "essential" exception. 2.1.1 (A) allows certain functions (a freehand drawing canvas, a signature pad) to require pointer input because keyboard equivalents are essential. 2.1.3 removes that allowance entirely — every function must have a keyboard path.
In practice few Shopify storefronts trip 2.1.3 separately from 2.1.1. The criterion most often comes up for design tools, signature flows, or drawing-based product configurators.
Common Shopify failure
Customizable-product configurator with a drawing canvas (e.g., engraving preview) that requires mouse drawing.
How to fix it
Provide a text-input alternative for the engraving — type the text, render to canvas server-side.
Primary source: W3C — WCAG 2.0 Understanding 2.1.3