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How to get element from Embed/Object of HTML page with JavaScript?

I have included Object/Embed in HTML-file of application to display another web page. ie

<!DOCTYPE HTML>

<html>
<head>
<meta name="viewport" content="width=device-width, user-scalable=no">
<meta http-equiv="Content-type" content="text/html; charset=utf-8"/>
<title>PhoneGap</title>
<link rel="stylesheet" href="master.css" type="text/css">
<script type="text/javascript" charset="utf-8" src="cordova-1.9.0.js"></script>
<script type="text/javascript" charset="utf-8" src="main.js"></script>
</head>
<body onload="init();">
    <!-- <embed id='embadedContent' height = 400 width= '100%' src="http://192.168.2.44:9191/testtwo/"/> -->
    <object height = 400 width= '100%' data="http://192.168.2.44:9191/testtwo/">
        <param name="quality" value="high">
    </object>
</body>
</html>

Now, I want to get reference of components which are in Webpage ( http://192.168.2.44:9191/testtwo/ ) like button, textfield, etc. so that based on logic I can change property of these elements.

You can't, thanks to the Same Origin Policy . The origin of your page ( http://localhost:9191 ) is different from the origin of the embedded page *( http://192.168.2.44:9191/testtwo/ ).

Use the id tag to later refere to the element, eg like this: id="myObject1"

<object id="myObject1" height = 400 width= '100%' data="http://192.168.2.44:9191/testtwo/">
 <param name="quality" value="high">
</object>

And then you can access it via JavaScript:

var myObject1 = document.getElementById("myObject1")
myObject1.style.height = "200px"

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