When rendering into HTML GroupDocs.Viewer renders text and graphics as a single layer that improves performance and reduces HTML document size. To improve content positioning when rendering multi-layered PDF document GroupDocs.Viewer for Java provides setEnableLayeredRendering() option that enables rendering of text and graphics according to z-order in original PDF document when rendering into HTML.
Note
This option is supported when rendering to HTML only.
Following code sample demonstrates how to enable layered rendering.