Solutionunvalidated
Use a different rendering approach such as embedding a JavaFX WebView in the Swing UI to get full HTML/CSS support, or avoid the Swing HTML renderer and render the code block background/border manually with custom Swing painting.
a3fd5126-3c39-4603-945e-763a5d7cbbf2
Use a different rendering approach such as embedding a JavaFX WebView in the Swing UI to get full HTML/CSS support, or avoid the Swing HTML renderer and render the code block background/border manually with custom Swing painting.