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chromium/content/test/data/site_isolation/js-html-polyglot.html 

<!--/*--><html><body><script type="text/javascript"><!--//*/

// This is a regression test for https://crbug.com/839425
// which found out that some script resources are served
// with text/html content-type and with a body that is
// both a valid html and a valid javascript.
var blah = 123;

//--></script></body></html>