If you want to provide a toggle, you might be better off including the capitalization in the raw content and using this CSS property to do the lowercasing: https://developer.mozilla.org/en-US/docs/Web/CSS/text-transf...
i do have css for down-casing title etc however
spoke more in depth about this stylistic decision, with context, here: https://www.everyonehatesmarketers.com/marketing-without-bud...