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by chungy 1297 days ago
WebP's lossy codec is based on VP8 intraframes; the lossless codec is original. Either mode of which is contained in a RIFF file, which is where the dimension limits happen (RIFF's headers have enough space to represent 2^14-1).

WebM is, strictly speaking, a container format that is a subset of Matroska. It doesn't have any real relation to WebP.