Element.getAttributeNames()

let attributeNames = element.getAttributeNames();

// Itérer sur les attributs de l'élément
for (let name of element.getAttributeNames()) {
  let value = element.getAttribute(name);
  console.log(name, value);
}

if (Element.prototype.getAttributeNames == undefined) {
  Element.prototype.getAttributeNames = function () {
    var attributes = this.attributes;
    var length = attributes.length;
    var result = new Array(length);
    for (var i = 0; i < length; i++) {
      result[i] = attributes[i].name;
    }
    return result;
  };
}