Doesn't seem like the comma is optional according to https://tools.ietf.org/html/rfc2397, which it's > data:[<mediatype>][;base64],<data> and [wikipedia](https://en.wikipedia.org/wiki/Data_URI_scheme) says > The comma is required in a data URI, even when the data part has zero length.
Bug 1579331 Comment 3 Edit History
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Doesn't seem like the comma is optional according to https://tools.ietf.org/html/rfc2397, which says it's > data:[<mediatype>][;base64],<data> and [wikipedia](https://en.wikipedia.org/wiki/Data_URI_scheme) says > The comma is required in a data URI, even when the data part has zero length.