What\'s the Optimal Size for a Minimalistic Transparent Data URI Image?

Minimalistic Data URI for Transparent Images

Envision utilizing a 1x1 transparent image alongside a background image within CSS. This enables the utilization of sprites while still providing alternative text for specific icons.

To optimize performance, consider employing data URIs for images. However, what is the optimal size for creating a transparent image using this approach?

The Concise Response

Through extensive experimentation with transparent GIFs, certain images exhibited instability and caused glitches within CSS. For instance, attempts to add a background image to a transparent GIF using the smallest possible dimensions may hinder its functionality. Oddly, certain GIFs, such as the one below, can block CSS backgrounds in some browsers.

Shorter but Unstable (74 bytes)

data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==

Stable but Slightly Longer (78 bytes)

data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7

An additional consideration is to refrain from omitting "image/gif" as a suggestion often found within comments. This omission can lead to malfunction in multiple browsers.

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