Custom tab order
tabindex
Some elements force themselves to a specific position in the keyboard tab order, which usually makes navigation jump around unpredictably.
Who this affects
Keyboard users, whose focus jumps out of visual order.
Fix it in WordPress
Search theme and plugin templates for positive tabindex values and remove them.
What the fix is, technically
Use tabindex="0" or no tabindex at all, and let the page order do the work.
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