The Actual Canvas 
Given MIMEType: image/png
Used MIMEType: data:
MIME types DIFFER.

Given MIMEType: image/jpeg
Used MIMEType: data:
MIME types DIFFER.

Given MIMEType: image/gif
Used MIMEType: data:
MIME types DIFFER.

Given MIMEType: 
Used MIMEType: data:
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Given MIMEType: null
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MIME types DIFFER.

Given MIMEType: undefined
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Given MIMEType: image/x-webkitbitmap
Used MIMEType: data:
MIME types DIFFER.