What this site does
Every page is a real HTML document with a heading outline you can navigate, a skip link to the main content, and landmarks in the right places. The reference pages render diagrams with JavaScript, and every one of them also exists as its own crawlable URL with the same information in prose.
Meaning never rides on colour alone
This matters more here than on most sites, because the mánico grids are the whole subject. A slot’s stroke is written out as a word — down, up, muted, rest — in the table cell itself, and the accent row says “accent” rather than shading a box. A reader who sees no colour at all loses nothing from those tables.
Two of the four necks have no frets
The violin is bowed and the guitarrón is fretless, and the site says so in words rather than expecting you to infer it from a diagram: those pages call the neck a fingerboard and their positions semitones, everywhere, including in the headings and the section navigation. The vocabulary comes from the instrument data rather than from a site-wide default, so it cannot drift out of step with the picture.
Keyboard and screen reader
Every control is reachable and operable from the keyboard, including the theme picker, the left-handed toggle and the instrument switcher. Catalog repaints announce themselves through a polite live region, so a change that happens without navigation is not silent.
Motion, contrast and zoom
There is no autoplaying motion anywhere. Colour contrast is checked automatically against the site’s default theme on every build, and the layout reflows to a single column without horizontal scrolling at 320 pixels and at 400% zoom.
Where it falls short
If you hit something that does not work with your setup, please say so, and describe what you were using — that report is the only reliable way these gaps get found.