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chromium/third_party/blink/renderer/core/testing/data/theme_color_test.html 

 <html>
  <head>
  <meta id="tc1" name="theme-color" content="  blue   ">
  <meta id="tc2" name="theme-color" content="  red   ">
  </head>
  <body>
  </body>
</html>