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Created attachment 11910 [details]
Copy of the ApiSandbox result

Although the code for
https://www.wikidata.org/w/api.php?action=wbgetentities&format=jsonfm&sites=ptwiki&titles=Predefini%C3%A7%C3%A3o%3AP%C3%A1gina%20de%20testes&props=sitelinks&languages=en%7Cpt%7Cpt-br
is formatted correctly as HTML, the result for the same query using the ApiSandbox shows escaped HTML.

Maybe this is related to
https://gerrit.wikimedia.org/r/#/c/44274/
(the only recent change related to HTML I noticed on API code)

Already fixed in Gerrit change #52296.