General
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maxwidth
This is the maximum width of the embed in pixels.
maxheight
This is the maximum height of the embed in pixels.
width
Will scale embeds type rich and video to the exact width that a developer specifies in pixels.
callback
The callback is the name of the javascript function to execute.
wmode
Will append the wmode value to the flash object.
window
opaque
transparent
allowscripts
In some cases, you may need the script tag for saving and displaying later. In order for Embedly to send the script embeds over jsonp add allowscripts.
nostyle
These all have style elements and inline styles associated with them that make the embeds look good. If you wish to style these embeds yourself, you can add nostyle and Embedly will remove the style elements.
autoplay
This will tell the video/rich media to automatically play when the media is loaded.
videosrc
Either true Embedly will use the video_src meta or Open Graph tag to create a video object to embed.
words
The words parameter has a default value of 50 and works by trying to split the description at the closest sentence to that word count.
chars
chars is much simpler than words. Embedly will blindly truncate a description to the number of characters you specify adding ... at the end when needed.