Do template CSS classes ever changes?

I'm using the Harris template and adding some custom code which uses both the standard template CSS classes (i.e.: sqs-block, html-block, sqs-block-html, sqs-block-content,quote-block, sqs-block-quote) and custom CSS.

All looks good, but my concern is that, if the standard classes change, the page will not render properly.

How likely is that they will change?

Thanks,

Ivan

They will change. Not often, but they will change.

This usually happens when Squarespace introduce new features and this may "break" your code. When adding new classes they do try to leave the old ones in place - for maximum compatibility - but this doesn't always happen. 

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Thanks Paul. That's is my concern. I'll probably create my own classes so that I don't need to worry about it.