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For the time being also viewable here:
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Just noticed caniuse does link to https://kangax.github.io/compat-table/es6/#test-String.prototype_methods_String.prototype.includes, but it provides said link in documenting the non-existent "String#contains" and "Array#contains" methods.
See: http://caniuse.com/#search=.contains
While Github added a lovely thumbs-up voting button, it says explicitly in the projects documentation that '+1' comments should be used to support a feature. Further, it's apparent that those comments are being automatically counted and shown here: http://caniuse.com/issue-list/
If you want to show your support for this issue, please use the old +1 comments.
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Now available at https://caniuse.com/#feat=es6-string-includes
Most helpful comment
Now available at https://caniuse.com/#feat=es6-string-includes