Cells with Spanning Headers

Used in the post Support for `headers` Attribute. The red marks in the upper left corner of some cells are debugging for me — they indicate cells with no headers attribute. Validate.

Test 1: Using headers Attribute

Using headers Attribute
Region Author Title Year ISBN Formats Available
13 10 Paper Audio Digital
Asia Murasaki Shikibu The Tale of Genji 1021 9780142437148 014243714X ✔
Europe Miguel De Cervantes The Ingenious Gentleman Don Quixote of La Mancha 1605 9783125798502 3125798507 ✔ ✔ ✔
Novelas ejemplares 1590–1612 unknown unknown
La Galatea 1605 9788437613154 unknown ✔
Sir Isaac Newton The Method of Fluxions and Infinite Series: With Its Application to the Geometry of Curve-lines 1763 9781330454862 1330454863 ✔ ✔ ✔
Mary Shelley Frankenstein; or, The Modern Prometheus 1818 9781530278442 1530278449 ✔ ✔ ✔
The Last Man 1826 unknown 0192838652 ✔
The Beautiful Widow 1835 unknown 1551110776 ✔ ✔
North America Herman Melville Moby-Dick; or, The Whale 1851 9781530697908 1530697905 ✔ ✔ ✔
F. Scott Fitzgerald This Side of Paradise 1920 9781657584419 1657584410 ✔ ✔ ✔
The Great Gatsby 1925 9780743273565 0743273567 ✔ ✔
Nnedi Okorafor Who Fears Death 2010 9780756406691 0756406692 ✔ ✔ ✔
Africa The Book of Phoenix 2015 9780756410780 0756410789 ✔ ✔ ✔
Remote Control 2021 9781250772800 125077280X ✔ ✔ ✔

Test 2: No headers Attribute

No headers Attribute
Region Author Title Year ISBN Formats Available
13 10 Paper Audio Digital
Asia Murasaki Shikibu The Tale of Genji 1021 9780142437148 014243714X ✔
Europe Miguel De Cervantes The Ingenious Gentleman Don Quixote of La Mancha 1605 9783125798502 3125798507 ✔ ✔ ✔
Novelas ejemplares 1590–1612 unknown unknown
La Galatea 1605 9788437613154 unknown ✔
Sir Isaac Newton The Method of Fluxions and Infinite Series: With Its Application to the Geometry of Curve-lines 1763 9781330454862 1330454863 ✔ ✔ ✔
Mary Shelley Frankenstein; or, The Modern Prometheus 1818 9781530278442 1530278449 ✔ ✔ ✔
The Last Man 1826 unknown 0192838652 ✔
The Beautiful Widow 1835 unknown 1551110776 ✔ ✔
North America Herman Melville Moby-Dick; or, The Whale 1851 9781530697908 1530697905 ✔ ✔ ✔
F. Scott Fitzgerald This Side of Paradise 1920 9781657584419 1657584410 ✔ ✔ ✔
The Great Gatsby 1925 9780743273565 0743273567 ✔ ✔
Nnedi Okorafor Who Fears Death 2010 9780756406691 0756406692 ✔ ✔ ✔
Africa The Book of Phoenix 2015 9780756410780 0756410789 ✔ ✔ ✔
Remote Control 2021 9781250772800 125077280X ✔ ✔ ✔