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If your HTML Email contains a CSS comment and inside that comment is a tag (see tag below: <code _tmplitem="277" >) then the email will render empty in Hotmail ISP including Outlook.com!!
/* This most probably won\'t work in all email clients. Don\'t include <code _tmplitem="277" > blocks in email. */
How To Embed Videos in an HTML Email
It should be noted that nowadays most all webmail clients, like Gmail, it is enough to simply put a YouTube link in the body of the email, and Gmail will render that link as a playable video embedded directly within the body of the email. There are other email clients that do this as well. Another way to embed a video is using the HTML 5 video tag, as shown in the following section.
Using the HTML 5 Video Tag
Following is a simple example of how to use the HTML 5 video tag that you would place anywhere within the <body> tag of your HTML email.
Note: this tag only has limited support, in a limited set of mail clients
- Poster – the opening image to display prior to playing the video
- Src – the URL to the video
- Type – indicates video format of the video you're using, for example:
Currently, there are 3 supported video formats types: MP4, WebM, and Ogg:
from Firefox 21
from Firefox 30 for Linux
From Opera 25
- MP4 = MPEG 4 files with H264 video codec and AAC audio codec
- WebM = WebM files with VP8 video codec and Vorbis audio codec
- Ogg = Ogg files with Theora video codec and Vorbis audio codec