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chromium/third_party/blink/web_tests/external/wpt/html/dom/elements/global-attributes/dir_auto-isolate-ref.html 

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>HTML Test: dir=auto, isolated in LTR text</title>
    <link rel="author" title="Matitiahu Allouche" href="mailto:[email protected]" />
    <link rel="author" title="Oren Roth" href="mailto:[email protected]" />
    <link rel="author" title="HTML5 bidi test WG" href="mailto:[email protected]" />
    <link rel="help" href="https://html.spec.whatwg.org/multipage/#the-dir-attribute" />
    <meta name="assert" content="
      When dir='auto', the direction is set according to the first strong character
      of the text, but the element behaves externally as a neutral character.
      In this test, it allows a preceding R to form a single directional run
      with a succeeding number." />
    <style>
      input, textarea {
        font-size:1em;
      }
      body {
        font-size:2em;
      }
      .test, .ref {
        border: medium solid gray;
        width: 400px;
        margin: 20px;
      }
      .comments {
        display: none;
      }
    </style>
  </head>
  <body>
    <div class="instructions"><p>Test passes if the two boxes below look exactly the same.</p></div>
    <div class="comments">
      Key to entities used below:
      &#x05D0; - The Hebrew letter Alef (strongly RTL).
      &#x202D; - The LRO (left-to-right override) formatting character.
      &#x202C; - The PDF (pop directional formatting) formatting character; closes LRO.
    </div>
    <div class="test">
      <div dir="ltr">
        &#x202D;1 a! &#x05D0;&#x202C;
      </div>
      <div dir="rtl">
        &#x202D;a !&#x05D0; 1&#x202C;
      </div>
    </div>
    <div class="ref">
      <div dir="ltr">
        &#x202D;1 a! &#x05D0;&#x202C;
      </div>
      <div dir="rtl">
        &#x202D;a !&#x05D0; 1&#x202C;
      </div>
    </div>
  </body>
</html>