Builds viewport-fixed DOM overlays (see PdfrxViewerOptions.viewerOverlayBuilder). Return one element, an array, or null/undefined for none. Position elements in view-space (CSS pixels).
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Builds viewport-fixed DOM overlays (see PdfrxViewerOptions.viewerOverlayBuilder). Return one element, an array, or
null/undefinedfor none. Position elements in view-space (CSS pixels).