The markers in HTML lists rendered in JEditorPane are always rendered with antialiasing enabled. Antialiasing was enabled by JDK-8201925.

Rendering of list markers should follow the settings for text antialiasing.

To reproduce run the attached app:
java ListsInHTML
By default, Java uses LCD antialiasing for text and list markers are rendered with grayscale antialiasing.

Disable antialiasing
java -Dawt.useSystemAAFontSettings=off ListsInHTML
but the list markers are still rendered with antialiasing enabled.