About 1×1px Transparent GIF Images

When you need to create a 1×1 px transparent GIF image dynamically, you can use this data URL:

PLACEHOLDER_IMAGE_URL = (
    "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP"
    + "///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7"
)

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