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This colour name was added back in 2014, but the validator is reporting it as invalid. I tested that other colour names were reported as valid, and they were, so the validator is meant to support all valid colour names. Please can this one be added? Validator results: Value Error : color rebeccapurple is not a color value : rebeccapurple --- As a side topic, the latest Windows version for the OS field on this Bugzilla form is Windows XP. Please can you add 7, 8, 8.1 and 10, or delete the question if it is not relevant.