Yup, that's how I think of it too. Use <mark> to highlight text. But I get what you're saying. It can be confusing which appropriate tag to use in which case since it's always a bit subjective. I guess the way I approach it, don't overthink it too much and just pick the one that YOU think it's best. I know, it's not the best advice 😅 But know this, at least your site won't break if you accidentally use the wrong one. So pick one and if it doesn't seem right, always okay to change it 😆
I found this SO answer that I think gives a pretty good explanation of the semantic differences, though some examples would be helpful: stackoverflow.com/a/14741437/470925
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