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I suspect this is substacks default styling. It actually doesn’t set the tab-size which defaults to 8. However there seems to be some funky font-rendering going on so it adds an extra half (or maybe three-quarters) of a space per tab-character.

You can see this your self if you edit the markup in your browser’s inspector and add `contenteditable` attribute to the surrounding <pre>, then navigate down a line... it will jump forward just by slightly less then a column per indent level.

Tabs are the recommended indentation method for Go code. It is interesting that they switched after the first example, though.

I'm well aware of it. But I don't think I have ever seen an editor/website which would display it as 9 spaces. Github for example default to 4 spaces width.

Yes, this is very weird. But Go Playground[1] has always been using 8 spaces per tab for some reason. I always found that very jarring, particularly where almost every other editor or documentation has settled on 4 spaces per tab.

[1] https://go.dev/play/

Seems like it got fixed just now. Thanks for doing it. It looks much better now :)