PHP mysql connection in index.html?

I have noticed that on开发者_开发百科 my website index.html file that contaisn php code to connect to a mysql database does not run and it's also possible to view the php source. Is this normal? I noticed that when I removed the code and put it in its own php file it was fine.

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By default, PHP code is only executed in .php files.

HTML files contain raw markup and have nothing to do with PHP.
You probably want to create index.php.