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In some browsers (in FF, Chrome, and apparently IE8) you can use the
to embed an image file in HTML.
It looks something like this (taken from the RFC):
<IMG
SRC = "data: image / gif; base64, r0lgoddhmaawapaaaaaaap /// ywaaaaamaaw
aaac8ıypqcvt3wccdkilc7c0qwyghhswpjqu5yqmcysapyuvuulvonmoztfzgfz
bytb10qgxor0tqbqejhrnzofkvj + 5yiuqrxf5y5lkh / deuncp5ylwgsebtliosp
w / tpg7jpjhxyendzwtbfx0cxonkpjgbzi4diinwgdkf8kjdfnycqzxzeygejmjl
zegl9i2icvqanvailt6f5ij90m6mvuts4ok05m0vdk0q4xutwvkozrcd3iq9uis
f81m1oıcr7leewwclp7tunnkm3unna3f2jqfo97vriy / XL4 / f1cf5vwzxyym7ph
hhx4dbgykaaa7"
ALT = "Larry">
You can see that the data for the image is encoded in
. I believe you can also use this format to assign images in javascript and to use them in CSS.