Give every drag action a click alternative
G219 requires that anything achievable by dragging also be achievable through single pointer activations that involve no dragging. It is the only sufficient technique W3C documents for 2.5.7 Dragging Movements, a Level AA rule new in WCAG 2.2. W3C's framing is single pointer rather than keyboard, which matters, because the criterion asks for a pointer route and a keyboard-only alternative does not satisfy it. Four patterns appear in W3C's examples. Up and down arrows revealed after a single activation. A numeric position field where typing a new number reorders the list. A 'move selected items to' dropdown listing the drop targets. And clicking a different position on a radial control. The typed-position field is usually the cheapest of the four to build.
How we find it in an audit
Our reviewers try to complete every drag-dependent task using clicks and taps alone. Reordering, moving between columns, resizing, uploading, adjusting a range. Dragging as the only route is a finding. We check any keyboard alternative separately, and record it as useful without treating it as the fix this rule asks for.
How affected users experience it
Dragging asks for a press held over a path, and that is out of reach for people with tremors, for people using a head pointer or a switch, and for anyone whose pointing device gives one contact at a time. On a board where dragging is the only way to move a task, they cannot move a task. A 'move to' menu on each card makes the same board work for everyone, and it is faster for people who could already drag.
Passes vs. fails
Passes
Each task card carries a 'Move to' menu listing the columns, and files can be added through a Browse button as well as by dropping them.
Fails
A project board where the only way to move a task between columns is dragging it there.
Other ways to satisfy this rule
2 guides on this site are filed under 2.5.7 Dragging Movements. W3C lists this one as sufficient for that rule on its own. Implement it correctly, in a way your readers' software actually supports, and the rule is met.
This guide is our interpretation of W3C technique G219: Ensuring that an alternative is available for dragging movements that operate on content. W3C publishes its techniques as guidance rather than as the standard, and says so on every one of them. The success criterion is what conformance is measured against, and a technique is one documented way to meet it.