code: function filterAttributes(at) {
  	return (
  		!ignoredAttributes.includes(at.name) &&
  		at.name.indexOf(':') === -1 &&
  		(!at.value || at.value.length < MAXATTRIBUTELENGTH)
  	);
  }
docs: Filter the attributes
  @param {Attribute}		The potential attribute
  @return {Boolean}		 Whether to include or exclude