HTML in Swing does not support specifying two or more classes [1] to an element.

For example, the following paragraph

<p class="bold italic">bold + italic</p>

should be rendered with styles of both bold and italic classes. But neither style is applied to <p> in Swing.


This bug was found during code review [2] for JDK-8326734.

[1] https://www.w3.org/TR/html4/struct/global.html#adef-class
[2] https://github.com/openjdk/jdk/pull/18550#discussion_r1558128238