Leonardo di ser Piero da Vinci (Italian: [leoˈnardo di ˌsɛr ˈpjɛːro da (v)ˈvintʃi]; 14/15 April 1452 – 2 May 1519), known as Leonardo da Vinci, was an Italian polymath of the Renaissance whose areas of interest included «invention, drawing, painting, sculpture, architecture, science, music, mathematics, engineering, literature, anatomy, geology, astronomy, botany, paleontology, and cartography». He has been variously called the father of palaeontology, ichnology, and architecture, and is widely considered one of the greatest painters of all time (despite perhaps only 15 of his paintings having survived).

Leonardo is renowned primarily as a painter. The Mona Lisa is the most famous of his works 34 and the most popular portrait ever made. The Last Supper is the most reproduced religious painting of all time35 and his Vitruvian Man drawing is regarded as a cultural icon as well36. Salvator Mundi was sold for a world record $450.3 million at a Christie's auction in New York, 15 November 2017, the highest price ever paid for a work of art. Leonardo's paintings and preparatory drawings—together with his notebooks, which contain sketches, scientific diagrams, and his thoughts on the nature of painting—compose a contribution to later generations of artists rivalled only by that of his contemporary Michelangelo.

Above is some random text to appreciate lines height, and how much height or pages the same text occupy with each font — with bits in bold and italic, numbers and footnote links.
These are some numbers and possibly ambiguous letters and symbols:
427, 809, 1635, 1IlLi, oO0, _-=+*#$~,;:!()[]{} "'«»
Next are some bits to appreciate this font's OpenType features:
This might show some ligatures: afflicting filling.
This line might be in Small Caps.
Lining numbers 123456 vs 123456 oldstyle numbers.
Finally, some words in various scripts to see how the baseline and height of this font and those of the fallback fonts compare: a few classic greek words are νους, intelligence, ειδος, form, and λογος, which have nothing to do with the following text in simplified chinese 关门吃及刃, and the same text in traditional chinese 关门吃及刃 or in japanese 关门吃及刃. Nothing in common either with these RTL and BiDi bits in hebrew סֶּלַע ססס and in arabic الرحيم (123 456) الْحَمْدُ and وال (بااتي: abcd) من. This should be enough to appreciate this font.
This is some sample content. You can have this document generated with some text of yours in your prefered language(s) by creating and adding it to a file named:
`koreader/settings/font-test-sample.html`