How to use nested tags in thymeleaf3 Tags

Suppose in a Thymeleaf3 Template , You want to use the following operations . In one use Thymeleaf3 Under the label of grammar , Nesting uses another Thymeleaf3 Grammar tags .

<h1 th:text="${header.title}" >
   title
   <small th:text="${header.subtitle}" >Subtitle</small>
</h1>

The result you want to generate is

<h1>
   title
   <small>Subtitle</small>
</h1>

But the actual result is

<h1>
   title
</h1>

The feasible scheme is as follows ：

1. Use the inline scheme

<h1 th:inline="text" >
   [[${header.title}]]
   <small th:text="${header.subtitle}">Subtitle</small>
</h1>

2. Or use the remove tag scheme

<h1>
    <span th:text="${header.title}" th:remove="tag">title</span>
    <small th:text="${header.subtitle}" >Subtitle</small>
</h1>

Reference documents ：

1. templates - Thymeleaf th:text - Put a text without removing HTML structures - Stack Overflow