tea-time, and we've no time to wash the things between whiles.'

  `Then you keep moving round, I suppose?' said Alice.

  `Exactly so,' said the Hatter:  `as the things get used up.'

  `But what happens when you come to the beginning again?' Alice
ventured to ask.

  `Suppose we change the subject,' the March Hare interrupted,
yawning.  `I'm getting tired of this.  I vote the young lady

arrow(data, options) {\n  // arrow depends on keepTogether in order to work\n  if (!isModifierRequired(data.instance.modifiers, 'arrow', 'keepTogether')) {\n    return data;\n  }\n\n  let arrowElement = options.element;\n\n  // if arrowElement is a string, suppose it's a CSS selector\n  if (typeof arrowElement === 'string') {\n    arrowElement = data.instance.popper.querySelector(arrowElement);\n\n    // if arrowElement is not found, don't run the modifier\n    if (!arrowElement) {\n      return data;\n   ...