No subject

Fri Mar 7 15:32:22 PST 2014

"The user agent must act such that the typeof operator in JavaScript returns the string undefined when applied to the object returned for all."

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Date: Mon, 1 Dec 2014 07:40:04 -0800
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<html>
    <head>
      <base href="https://bugs.webkit.org/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - document.all can be both 'function' and 'not function'"
   href="https://bugs.webkit.org/show_bug.cgi?id=139129">139129</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>document.all can be both 'function' and 'not function'
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>528+ (Nightly build)
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>JavaScriptCore
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>zimbabao&#64;gmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>typeof document.all === 'function' return true 
and 
var type = typeof document.all;
type === 'function' will return false.

So if you combine two statements or keep them separate they return different answer.

This is happening because document.all is returned to be CallTypeHost.