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Presets are now radio buttons with labels, and menu items that take actions are now buttons. The <li> representing each menu item is now a thin wrapper around another element: a <label> for radio buttons, a <button> for other buttons, and a <div> for submenu headings. All of the things that previously applied to the <li> now apply to that inner element instead. This means that presets can now use the standard "checked" attribute to indicate which one is selected, and buttons can be disabled using the standard "disabled" attribute. It also means that we can query and set the state of all the presets at once through their RadioNodeList. I think this should also make the menus more accessible, and make it easier to make them keyboard-controllable.
This is the README accompanying the source code to Simon Tatham's puzzle collection. The collection's web site is at <https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>. The puzzle collection is built using CMake <https://cmake.org/>. To compile in the simplest way (on any of Linux, Windows or Mac), run these commands in the source directory: cmake . cmake --build . The manual is provided in Windows Help format for the Windows build; in text format for anyone who needs it; and in HTML for the Mac OS X application and for the web site. It is generated from a Halibut source file (puzzles.but), which is the preferred form for modification. To generate the manual in other formats, rebuild it, or learn about Halibut, visit the Halibut website at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.