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The text should use future tense. And maybe a simpler way of expressing what needs to be said. Way too confusing. Now: For example, "attributes" in end tags are ignored currently, but they are invalid, in case a future change to the language makes use of that syntax feature without conflicting with already-deployed (and valid!) content. Suggestion: For example, "attributes" in end tags are ignored currently. They will be invalid, in case a future change to the language will make use of that syntax feature. (The following is a different context, has not much to do with the condition before.) A future change to the language should/must not conflict with already deployed (and valid!) content. Finally, what deployed and valid content in the end tag?
HTML5.1 Bugzilla Bug Triage: Fixed, reworded sentence to better convey meaning. https://github.com/w3c/html/pull/238 If this resolution is not satisfactory, please open a new issue at the W3C HTML5 Issue tracker: https://github.com/w3c/html/issues/new where it will be re-triaged. Thanks!