[greasemonkey-users] How to select an node inside of an iframe document?

Sat, 20 Sep 2014 04:39:07 -0700 

 

I'm creating a simple user script to Greasemonkey and I want to select an 
node that is inside of an iframe document. The node that I want to select 
is an <embed> that is in an iframe document hosted in other domain:

<iframe style="height: 631px;" class="smart_sizing_iframe" scrolling="no" 
 id="iframe_canvas" name="iframe_canvas_fb_https" src="javascript:""" 
 webkitallowfullscreen="" mozallowfullscreen="" oallowfullscreen="" 
 msallowfullscreen="" allowfullscreen="" height="800" frameborder="0">
  <html>
    <body>
      <div>
        <div>
          <embed style="display: block; width: 1325px; height: 631px; 
           margin-left: 15px; margin-top: 0px;" disablecontextmenu="true" 
           
progressframeimage="https://fbstatic-a.akamaihd.net/rsrc.php/v2/yO/r/xE2zuu-toia.png";
 
           
progressbarimage="https://fbstatic-a.akamaihd.net/rsrc.php/v2/yV/r/cIFShcsRTg9.png";
 
           
logoimage="https://fbcdn-photos-f-a.akamaihd.net/hphotos-ak-xpa1/t39.2081-0/p128x128/851582_531935076922613_15198766_n.png";
 
           firstframecallback="UnityObject2.instances[0].firstFrameCallback();" 
           type="application/vnd.unity" 
src="https://deadtrigger2-fb.ssl.hwcdn.net/0.7.0-rc1-r49324/DeadTrigger2.unity3d";
           height="631" width="1354">
          </embed>
        </div>
      </div>
    </body>
  </html>
</iframe>

My JavaScript lines (I set @include for both domains):

// @include    https://*.facebook.com/deadtrigger_ii/
// @include    https://integrated-plugin-canvas-*-*.fbsbx.com/apps/*/?params=*
var iframe = document.getElementById('iframe_canvas');
var otherdocument = iframe.contentDocument || iframe.contentWindow.document;
var unity = otherdocument.querySelector("embed[type='application/vnd.unity']");
unity.style.setProperty("margin", "0px", "important");

Is there some problem? What do I need to do to get that <embed>?

I'm very amateur in JavaScript, I need help. Thanks.

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