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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Webkit adds multiple &amp;nbsp; to HTML pasted into contenteditable element."
   href="https://bugs.webkit.org/show_bug.cgi?id=154676">154676</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Webkit adds multiple &amp;nbsp; to HTML pasted into contenteditable element.
          </td>
        </tr>

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

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

        <tr>
          <th>Version</th>
          <td>Safari 9
          </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>HTML Editing
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>j.swiderski&#64;cksource.com
          </td>
        </tr></table>
      <p>
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        <pre>Created <span class=""><a href="attachment.cgi?id=272201" name="attach_272201" title="Sample page which shows how browsers sees HTML.">attachment 272201</a> <a href="attachment.cgi?id=272201&amp;action=edit" title="Sample page which shows how browsers sees HTML.">[details]</a></span>
Sample page which shows how browsers sees HTML.

Safari Version       : 9.0.3 (11601.4.4)
Other browsers tested: 
     Chrome: Fail, version: 48.0.2564.116 m
    Firefox: OK 
         IE: OK
----

What steps will reproduce the problem?
1. Open attached sample in a browser.
2. Go to <a href="https://en.wikipedia.org/wiki/HTTPS">https://en.wikipedia.org/wiki/HTTPS</a> and copy first paragraph (from HTTPS to <a href="https://en.wikipedia.org/wiki/HTTPS">https://en.wikipedia.org/wiki/HTTPS</a>)
3. Paste it in editable element, click the &quot;Get HTML&quot; button and observe what HTML gets produced.

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What is the expected result?

The expected HTML is without &amp;nbsp; being inserted before closing and after opening span tag.

If I go to <a href="https://en.wikipedia.org/wiki/HTTPS">https://en.wikipedia.org/wiki/HTTPS</a> and execute below in console everything seems to be in order 
console.log(document.getElementById('mw-content-text').getElementsByTagName('p')[0].innerHTML);
Also viewing HTML with dev-tools doesn't show any &amp;nbsp;

----

What happens instead?

There are &amp;nbsp being inserted before closing and after opening span tag.


Please provide any additional information below. Attach a screenshot if possible.
I have tested this on Windows 7 and Mac 10.11</pre>
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