Change Details

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1. Go to https://en.wikipedia.org/w/index.php?title=Template:X1&oldid=840783873 2. Test the link. It should give you a 404 error due to the escaping. 3. Open the revision in the 2017 wikitext editor. 4. Add a space, and then preview the revision. 5. Test the link. It should work, due to an incorrect escaping implementation.