A small but change happened in JDK 8 (AdoptOpenJDK / Temurin) between u292 and u332. In u332, DOM to XML conversion of a br DOM element emits the string <br />. In u292, the Transformer emits the string without the space: <br/>.
In the XML specification I found the rules for Tags for empty elements (https://www.w3.org/TR/xml/#d0e2480). Do I understand correctly that <br/> did not comply with the specification?
(as there must be at least one whitespace between slash and closing greater-than sign)
CodePudding user response：
No, there may be, but need not be, whitespace immediately preceding the />:
[44] EmptyElemTag ::= '<' Name (S Attribute)* S? '/>' [WFC: Unique Att Spec]
The ? in S? means that S (whitespace) may optionally appear.
Software should not depend upon the presence or absence whitespace there.