Всплывающие подсказки с data-hint

/* Находим все input  */ 
var input = document.querySelectorAll('input'); 
 
/* Проходим циклом по все найденым input*/ 
for(var i = 0; i < input.length; i++) { 
  /*  Если input содержит атрибут data-hint выполнем код внутри if  */ 
  if ( input[i].getAttribute("data-hint") != null) { 
        /*  Создаем контейнер span  */ 
        var span = document.createElement('span'); 
        /* Присваиваем созданному span класс  */ 
				span.className = "hint  hint--right  hint--info"; 
        /* Присваиваем созданному span содержимое  */ 
				span.innerHTML = "?"; 
        /* Вставляем в span атрибут data-hint и присваиваем значение из найденного input */ 
        span.setAttribute("data-hint", input[i].getAttribute("data-hint")); 
				insertAfter(span, input[i]); 
			}  
  } 
 
/* Функция вставляет elementInstertAfter после parentElement  */ 
function insertAfter(elementInstertAfter, parentElement) { 
	return parentElement.parentNode.insertBefore(elementInstertAfter, parentElement.nextSibling); 
}

/*! Hint.css - v2.3.0 - 2016-05-21 
* http://kushagragour.in/lab/hint/ 
* Copyright (c) 2016 Kushagra Gour; Licensed  */ 
 
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<form id="form"> 
 
    <p>Введите текст:</p> 
    <input type="text" size="50" data-hint="О, это подсказка"> 
 
    <p>Форма:</p> 
    <input type="text" size="50"> 
 
    <p>Введите текст 2:</p> 
    <input type="text" size="50" data-hint="О, это вторая подсказка"> 
 
 
  </form>

<!DOCTYPE html> 
   <html> 
  <head> 
    <meta charset = "utf-8"> 
    <title>JS-1</title> 
 
    <link href = "https://kushagragour.in/lab/hint/hint.min.css" rel = "stylesheet"/> 
  </head> 
 
  <body> 
   <p>Введите текст:</p> 
    <input type = "text" size = "50"> 
    <span class="hint  hint--right  hint--info" data-hint="О, это подсказка">?</span> 
 
 
 
    <form id = "form"> 
      <p>Форма:</p> 
      <input type = "text" size = "50"> 
Hello Sir, <span class="hint hint--bottom" aria-label="Thank you!">hover over me.</span> 
    </form> 
 
  </body> 
</html>