code: function removeClass(element, className) {
    let elements = [].concat(element);
    let classes = [];
    let n = elements.length;
  
    if (!assert((typeof className === 'string') || (className instanceof Array), 'Invalid class name specified. Must be either a string or an array of strings.')) return;
  
    if (typeof className === 'string') {
      classes.push(className);
    }
    else {
      classes = className;
    }
  
    let nClasses = classes.length;
  
    for (let i = 0; i < n; i++) {
      let e = elements[i];
  
      for (let j = 0; j < nClasses; j++) {
        let c = classes[j];
  
        if (!assert(typeof c === 'string', 'Invalid class detected: ' + c)) continue;
  
        let regex = new RegExp('^' + c + '\\s+|\\s+' + c + '|^' + c + '$', 'g');
        e.className = e.className.replace(regex, '');
      }
  
      if (e.className === '') {
        e.removeAttribute('class');
      }
    }
  }
docs: Removes a class(es) from DOM element(s).
  
  @param {Node|Node[]} element - Target element(s).
  @param {string|string[]} className - Class(es) to remove.
  
  @alias module:requiem~dom.removeClass