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Steven Parker216,149 Points
I'm dubious of the "bad idea" advice.
I don't know who those guys are, but the the definitive resource I rely on is MDN.
The MDN page for tabindex doesn't seem to have any warnings or recommendations against using it. The one thing I might agree with the other guys on is that there could be better ways to get what you're ultimately after.
Robert Tyree13,335 Points
I hear you, but pretty sure it stands up.
HTML5.2 working draft: "Warning: Using a positive value for tabindex to specify the element’s position in the sequential focus navigation order interacts with the order of all focusable elements. It is error-prone, and therefore not recommended. Authors should generally leave elements to appear in their default order."