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I'm trying to embed a YouTube video into a text post on my Tumblr blog. I copied the HTML from YouTube and pasted it into the HTML of the post, but when I preview it, the video doesn't show up. In the code, the src attribute of the iframe is being nullified. So, all I see is an empty iframe on the page without the video.

Is there any reason why this is happening? How can I fix this?

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A link to your tumblr page and theme and/or source code would go a long way in making this a more answerable question. – batpigandme Sep 1 '13 at 0:21

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