Do you mean embedding of self written HTML or embedding an existing page?
For the first I would try:
For the second: just use the html include macro, just test it and it works perfect (you must configure your white list first)
The way to embed HTML code in a page is with the HTML macro. There is information on this page about how to do it https://confluence.atlassian.com/display/DOC/HTML+Macro.
Note that the HTML macros plugin is disabled by default, so your Confluence administrator will need to enable it before you can use this macro. More information about this also on the page above.
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