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Trying to access window.localStorage will generate an exception if the local storage is for some reason inaccessible. This can be demonstrated in Firefox by configuring it to block a site from using site data. Writing to local storage might also cause an exception if, for instance, the quota of data for a site is exceeded. If an exception is raised while loading preferences we log the fact but don't make any report to the user, behaving as if no preferences were found. This avoids annoying the user on every visit to a puzzle page if they're not trying to use preferences. If something goes wrong when saving, we do currently report that to the user in an alert box. This seems reasonable since it's in response to an explicit user action.
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/>.