(Really) Long Background Image Does Not Render on iPad Safari

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Mobile Safari has limits to what size background images it will display before subsampling, you may be getting hit by this problem because of the size of your background:

The maximum size for decoded GIF, PNG, and TIFF images is 3 megapixels for devices with less than 256 MB RAM and 5 megapixels for devices with greater or equal than 256 MB RAM.

That is, ensure that width * height ≤ 3 * 1024 * 1024 for devices with less than 256 MB RAM. Note that the decoded size is far larger than the encoded size of an image.

see: Know iOS Resource Limits

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