If the web documents are being created by a program, the programming language probably has an API to send the proper HTTP headers.
For static web pages, it may be necessary to add the MIME Type for HTML 5 Polyglot Documents to the HTTP web server configuration to send the appropriate Content-Type header. With the Apache HTTP Server, for example, the HTML 5 MIME Type can be added to the .htaccess file(s):
DirectoryIndex index.html
ErrorDocument 404 /error.html
AddType application/xhtml+xml;charset=UTF-8 html
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