test_firstParty.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset="utf-8"/>

  <title>Test for Bug 1260931</title>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

</head>

<body>

  <div>

    <iframe id="iframe1" src="https://example.com"></iframe>

    <iframe id="iframe2" sandbox="" src="https://example.com"></iframe>

    <iframe id="iframe3" sandbox="allow-same-origin" src="https://example.com"></iframe>

  </div>

</body>

</html>