ゆっくりしたい日曜日

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 document.addEventListener("keydown", event => {
    if (event.metaKey && event.keyCode === 39) {
      var current = document.activeElement;
      if (current.getAttribute("type") == "linkbtn"){
        var next = current.nextElementSibling;
        if (next) {
          next.focus();
        }else{
          var parent = current.parentNode;
          parent.firstElementChild.focus();
       }
      }else{
        document.querySelector('button[type="linkbtn"]').focus();
      }   
    }
  });

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  document.addEventListener("keydown", event => {
    if (event.metaKey && event.keyCode === 37) {
      const current = checkCurrentBtn(document.activeElement);
      if (current){
        previous = current.previousElementSibling;
      }else{
        return false
      }
      if (previous){
        previous.focus();
      }else{
        const parent = current.parentNode;
        parent.lastElementChild.focus();
      }
    }
  });

function checkCurrentBtn(current){
  if (! (current.getAttribute("type") == "linkbtn") ){
    document.querySelector('button[type="linkbtn"]').focus();
    return false;
  }else{
    return current;
  }
}