How to add source code comments in Thymeleaf templates that don’t get included in generated HTML?

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Version 2.1 is released so now you can upgrade your libraries and use comments in your code. With this version developers are able to use parser-level comment blocks:

<!--/* This code will be removed at thymeleaf parsing time! */-->

and prototype-only comment blocks:

<span>hello!</span>
<!--/*/
    <div th:text="${...}">

</div>
/*/-->
<span>goodbye!</span>

Detailed explanation can be found in the official documentation here: http://www.thymeleaf.org/doc/tutorials/2.1/usingthymeleaf.html#comments-and-blocks

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