Foreground diff: dark pixels are shared foreground, red is source-PDF-only foreground, and blue is HTML-only foreground.
Color heatmap: white pixels are background or excluded antialiased edges, gray is a close color match, and yellow through dark red indicates increasing perceptual color difference.
passed page-dimensions: Browser page dimensions match the PDF page dimensions.
passed text-run-count: The browser DOM contains the same number of text runs as the extracted layout.
passed word-boundaries: Rendered HTML text preserves word boundaries at the current threshold.
passed text-image-overlap: No text/image overlaps were found in the browser layout.
passed text-vector-overlap: No text/large-vector overlaps were found in the browser layout.
needs-review visual-foreground-mask: PDF and browser foreground masks differ beyond the current review thresholds.
skipped visual-color-difference: Color comparison found no stable shared-foreground interior pixels after excluding antialiased edges.