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Note: YouTube is serving thumbnails from 2 servers:

• //img.youtube.com
• //i.ytimg.com

Examples are with //i.ytimg.com server just because it’s shorter, no other particular reason. You can use both.

• Player Background Thumbnail (480x360):

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Drop in replace functions for setTimeout and setInterval that make use of requestAnimationFrame.

See overview article and Paul Irish's earlier post.

Courtesty of Joe Lambert

Copyright 2011, Joe Lambert.
Free to use under the MIT license.
http://www.opensource.org/licenses/mit-license.php

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.cursor {
    cursor: url("cursor.png") 0 0, pointer; /* Legacy */
    cursor: url("cursor.svg") 0 0, pointer; /* FF */
    cursor: -webkit-image-set(url("cursor.png") 1x, url("cursor@2x.png") 2x) 0 0, pointer; /* Webkit */
}