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chromium/third_party/blink/web_tests/external/wpt/html/semantics/document-metadata/the-base-element/example.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Example</title>
<base target="targetWin" href="">
<base target="_self" href="http://www.example.com/">
<link rel="author" title="Intel" href="http://www.intel.com/">
<a id="a1" href="example2.html" target="">click me</a>