Abiathar Online - Graphics fixed on Chrome

The last time I worked on Abiathar Online, I found that its graphics were messed up on Chrome - the first time a tile was requested, it wouldn't necessarily display until the level was refreshed. I'm still not sure why it was doing that, or why it worked before, but today I made a change that fixed the problem. This Stack Overflow answer taught me that I don't have to make an Image out of the temporary canvas before using it to draw on the main one. Canvases can be drawn on other canvases just fine. So I switched to caching canvases, only converting them to Base64 URLs when displaying them in the selected tile bay. Abiathar Online now appears as it should in both Chrome and Edge.