This free tool will create a valid XHTML embed code for any YouTube video. The code YouTube shows on the embed field is not valid XHTML! However, you can simply use this simple tool to make it Valid XHTML 1.0 Transitional.
Note: Starting from April 2018, Google Chrome changed the Autoplay policy. Videos even if they have enabled the autoplay option will not start automatically anymore. It is not related to YouTube, it is simply a browser policy.
Tip: There is also a similar tool to generate valid XHTML MySpace embed code, as well as one for valid XHTML Vimeo embed code.
Validate your code!
Remember that you should always validate your code to ensure maximum compatibility between browsers.
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