* 2023-02: used the mouse event techniques I described here: https://news.ycombinator.com/item?id=37703291
* 2023-02: added an interactive calculation of the number of hexagons in a spiral
* 2022-12: rewrote the introductory diagrams after trying out many alternative designs; wrote about it https://simblob.blogspot.com/2022/11/introduction-to-hexagon...
* 2022-10: removed server-side rendering, as it was complicating the build process, and it wasn't a clear win (page loaded slower)
* 2022-07: fixed some embarassing typos in the sample code (ugh)
* 2021-11: updated sample code to be easier to read and not use python-specific constructs; updated naming to be more clear about which code works on cube coordinates vs axial coordinates; filled in missing helper functions that I thought would be obvious but I should've included all along
* 2021-10: unified the hex implementation guide, which used q/r/s coordinate names for cube-hexagon and q/r for axial-hexagon and x/y for cartesian, with the hex theory page, which used x/z/y for cube-hexagons and q/r for axial-hexagons and x/y for cartesian. This was the last major update, as it involved updating all the text, diagrams, and sample code. The unification is something I had been wanting to do for several years but I knew it would take a while and it would also break "backwards compatibility" with everyone who had read the x/z/y version. It was especially tricky because x/z/y not x/y/z corresponded to q/r/s, and that's what led to the embarassing typos in code I had to fix later. And the change in order also changed which direction the rotation algorithm worked.
* 2021-01: updated the size & spacing diagram to visually show the relationships between the different measurements
* 2021-01: changed the hex and axis labels to try to make them correspond because it's a bit confusing; see https://simblob.blogspot.com/2021/01/hex-diagram-labels.html
* 2020-12: added a section about reflections https://www.redblobgames.com/grids/hexagons/#reflection
* 2020-04: improved the labels on the cube/hex diagram to try to improve the correspondence between the diagram and text https://www.redblobgames.com/grids/hexagons/#coordinates-cub...
* 2019-04: rewrote the map storage section because I wasn't at all happy with how it was written before; I wrote up the change https://simblob.blogspot.com/2019/03/improving-hexagon-map-s...
* 2019-02: used IntersectionObserver to delay the diagram rendering until you reach that section of the page; this improves page load times
* 2018-05: added the "doubled" coordinate system. It's a pretty nice system, and I didn't know about it when I first wrote the page. I learned about it from rot.js.
I had lots more changes in 2018. I had just reimplemented the entire page (https://simblob.blogspot.com/2018/04/april-updates-hex-grid-...) and that gave me lots of ideas of things to improve. I first rewrote it without changing the diagrams, but then went back and made lots of diagram and text changes.
It has improved significantly, at least in presentation, over time. Suspect the content has, too, but I have a less-clear recollection to assess the differences in content than I do for presentation from the last time I visited probably 3-5 years ago.