an interesting quirk I discovered by mistake because of the template, each tiddler opened adds its unique id to the css styling (for cyan block fill) in the template and the template (text widget transclusion) registers them all, instead of replacing any of the others. I use it for filling in nap sections like Wikipedia does for countries in their upper right corner world map on their pages.
I only said something about the unexpected behavior of the text widget in the template appending multiple ids to the style when it was just expected to read and transclude just one id in the field* of the currentTiddler of the tiddler it was being displayed in. I was expecting the id of each new tiddler opened to replace the id of the previously opened tiddler.
*each tiddler just had one id in the field being read
it will be useful for the video game interface svg constructs that I replaced the text content of the top bars and right sidebar divs (site title, subtitle, searchbar, toolbars and tabs segments) with. I been working on including TW buttons/actions functions (code) into them.