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copied!<ol> <li><p><strong>Turn the <code>embed</code> elements into <code>iframe</code> elements, don't forget the close tags.</strong></p> <p>The <a href="http://www.w3.org/TR/html5/the-iframe-element.html#the-embed-element" rel="nofollow">W3 - Technical Review - HTML 5 - The <code>embed</code> element</a> mentions</p> <blockquote> <p>The embed element represents an integration point for an external (typically non-HTML) application or interactive content.</p> </blockquote> <p>so you should rather use <code>iframe</code> elements instead of <code>embed</code> elements, <a href="http://www.w3.org/TR/html5/the-iframe-element.html#the-iframe-element" rel="nofollow">which</a> mentions:</p> <blockquote> <p>The iframe element represents a nested browsing context.</p> </blockquote> <p>in which <a href="http://www.w3.org/TR/html5/browsers.html#browsing-context" rel="nofollow">a browsing context is defined</a> as:</p> <blockquote> <p>A browsing context is an environment in which Document objects are presented to the user.</p> </blockquote></li> <li><p><strong>You can declaring a global variable in a script you use in the main page.</strong></p> <p>It is as simple as <code>var myvariable;</code></p></li> <li><p><strong>You can access the variable from within an iframe using <code>window.parent.myvariable</code>.</strong></p> <p><a href="https://developer.mozilla.org/en/DOM/window.parent" rel="nofollow">The DOM object <code>window.parent</code> is defined</a> as such:</p> <blockquote> <p>Returns a reference to the parent of the current window or subframe.</p> <p>If a window does not have a parent, its parent property is a reference to itself.</p> <p>When a window is loaded in an <code><iframe></code>, <code><object></code>, or <code><frame></code>, its parent is the window with the element embedding the window.</p> </blockquote> <p>A shortened version is to use <code>parent.myvariable</code>, as <code>window</code> is the root DOM object.</p></li> <li><p><strong>Make sure that the domains, protocols and ports of the different documents match.</strong></p> <p>Unless you want to be presented with a nasty error like:</p> <blockquote> <p>Unsafe JavaScript attempt to access frame with URL X from frame with URL Y.<br> Domains, protocols and ports must match.</p> </blockquote></li> </ol>

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