I'm not sure what you mean by drop and then re-introduce, buried in a Git commit. We made a single commit to remove keygen, after displaying a public deprecatio

I'm not sure what you mean by drop and then re-introduce, buried in a Git commit. We made a single commit to remove keygen, after displaying a public deprecation-will-be-removed notice in the spec for some years. Dropping keygen was part of a highly-public pull request, which gathered discussion from all browser vendors, as well as interested community members. The pull request was only merged once all four browser vendors supported removal (2 had already removed by that point).