Youtube embed: Unsafe JavaScript attempt to access frame

The security error is unlikely to break your page. It looks like the error is happening from within the YouTube frame, which means that in the worst case the content of the frame will be messed up.

A frame/iframe from an external page cannot, under any circumstances effect the content of the parent document unless they are from the same domain and port number. It is one of the hard rules of browser security.

The error must be elsewhere in your markup. Any chance of seeing some example markup?

[edit]

The error could also be in the embed code markup. Or, if any script tags are included directly on the page (not in the iframe) it could be there.

Usually when problems like this happens it is because of an unclosed tag somewhere but it could be Javascript as well.

If you are having an issue resolving that JavaScript error, you can try using YouTube's old embed code. It's an option on every YouTube video once you click on embed. You will not have that error because it does not use iframes. The code would look something like this:

<object width="560" height="315">    <param name="movie" value="http://www.youtube.com/v/9DXL9vIUbWg?version=3&hl=en_US&rel=0"></param>    <param name="allowFullScreen" value="true"></param>    <param name="allowscriptaccess" value="always"></param>    <embed src="http://www.youtube.com/v/9DXL9vIUbWg?version=3&hl=en_US&rel=0" type="application/x-shockwave-flash" width="560" height="315" allowscriptaccess="always" allowfullscreen="true"></embed></object>

Hope this helps.

I voted for Jonathan Torres' answer, because his code stopped the Javascript warnings. However I then discovered errors when I validated the code.

So my answer is this...

Tick the "Use old embed code" checkbox when using YouTube's embed code so you're not using the iframe.

To make the code validate you need to add....

type="movie"

and

data="http://SAME YOUTUBE URL USED IN THE FIRST PARAM ELEMENT/"

to the OBJECT element. Then make the PARAM elements self-closing (but not the EMBED element).

This should make your YouTube code look like this...

<object width="560" height="315" type="movie" data="http://www.youtube.com/v/9DXL9vIUbWg?version=3&hl=en_US&rel=0"><param name="movie" value="http://www.youtube.com/v/9DXL9vIUbWg?version=3&hl=en_US&rel=0"></param><param name="allowFullScreen" value="true" /><param name="allowscriptaccess" value="always" /><embed src="http://www.youtube.com/v/9DXL9vIUbWg?version=3&hl=en_US&rel=0" type="application/x-shockwave-flash" width="560" height="315" allowscriptaccess="always" allowfullscreen="true"></embed></object>

You then ought to get no Javascript warnings and your code should validate.