I saw some conflence demo with capability to include a HTML content.
However, I don't see HTML marco in my confluence installation.
Isn't HTML marco part of default Confluence feature?
thank in advance
The HTML macro is disabled by default, as it can be used to exploit your instance.
If you wish to enable it, and have system administrator permissions on your instance, then see https://confluence.atlassian.com/display/DOC/Enabling+HTML+macros
Have you checked if you have it enabled ?
To enable the HTML macros:
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