The buffer tag is not a self-closing tag. The content placed between the opening
and closing of this tag is saved to a buffer and its output is assigned to the
Java variable declared with the tag’s var attribute. The output is returned as
a String, letting you post-process it. For example, you can use this to
override a JSP’s existing contents.
The example below saves the link’s generated markup to a buffer and then uses
the returned string as the argument for a liferay-ui:message key:
<liferay-util:buffer
var="linkContent"
>
<aui:a
href="https://www.liferay.com/"
target="_blank">Liferay
</aui:a>
</liferay-util:buffer>
<liferay-ui:message
arguments="<%= linkContent %>"
key="see-x-for-more-information"
translateArguments="<%= false %>"
/>
Now you know how to use the <liferay-util:buffer> tag to save content to a
buffer.
Figure 1: You can use the Liferay Util Buffer tag to save pieces of markup to reuse in your JSP.