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On https://github.com/w3c/html/blob/master/README.md#how-the-branches-fit-together , both the image itself and the "HTML version of flowchart image" link are broken.
The graph did not represent reality any longer so has been removed in commit https://github.com/w3c/html/commit/2041728d0ec985814ee47240992cda507cdf25fb