Take this wikitext (reduced test case from regressions seen in rt-testing, one page being enwiki:Ambrose_Mendy).
{{Use dmy dates|date=September 2019}}
{{short description|British boxing promoter}}
'''
fooRun php bin/parse.php --dump dom:post-normal --scrubWikitext --wt2wt on it and look at the output before and after e495cda4b52e8398afb1bf2c407bfe69532e3acf and you will see that the DOM normalizer output has changed.