This is an HTML issue with your code 
and that error message is returned by your Browser. This is not an issue 
with Google. It is recommended to ensure you are correctly setting your 
charset as explain in w3schools 

<meta charset="UTF-8">

- Note that Google Groups is for general product discussions and is not for 
technical support. It is recommended to continue all further 
troubleshooting in your Stack Overflow 

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