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chromium/third_party/blink/web_tests/fast/selectors/attr-list-01.html 

<!DOCTYPE html>
<html>
  <head>
    <title>Whitespace-separated attribute selectors</title>
    <style>
      span { color: red; }
      [data-list~="b"] { color: green; }
      #t1:not([data-list~=" z"]) { color: green; }
      #t2:not([data-list~="u	"]) { color: green; }
    </style>
  </head>
  <body>
    <p>
      <span data-list="a	b	">This</span>
      <span data-list="a&#10;b&#13;c">text</span>
      <span data-list="a   &#12;b &#12;">should</span>
      <span id="t1" data-list="w  z x&#09;">be</span>
      <span id="t2" data-list="u&#09;">green</span>
    </p>
  </body>
</html>