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https://w3c.github.io/2dcontext/#dom-context-2d-filltext doesn't say anything (unlike Level 2) about markup the origin-clean as false. Again, this needs to be sync'ed with Level 2 otherwise it creates a security issue.
Should be fixed by https://github.com/w3c/2dcontext/commit/7937209404d8efa5351da3ba15bba6395e81d9da