axe-core/lib/checks/keyboard/tabindex-evaluate.js

Accessibility engine for automated Web UI testing

function tabindexEvaluate(node, options, virtualNode) {
  const tabIndex = parseInt(virtualNode.attr('tabindex'), 10);

  // an invalid tabindex will either return 0 or -1 (based on the element) so
  // will never be above 0
  // @see https://www.w3.org/TR/html51/editing.html#the-tabindex-attribute
  return isNaN(tabIndex) ? true : tabIndex <= 0;
}

export default tabindexEvaluate;