xmlns:th=http://www.thymeleaf.org: This XML namespace allows us to use Thymeleaf’s HTML processing directives.
th:each: Thymeleaf’s for-each operator, giving us a
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<html xmlns:th="http://www.thymeleaf.org">
<head>
<title>Writing a Reactive Web Controller</title>
</head>
<body>
<h2>Employees</h2>
<ul>
<li th:each="employee : ${employees}">
<div th:text=
"${employee.name + ' (' + employee.role + ')'}">
</div>
</li>
</ul>
</body>
</html>