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I am not sure how efficient -moz-any() really is, when it comes to performance. I can think that it’s considerably less efficient than .title <h1 class=“title”>
Good thoughts around the typography.
calc() is my favorite.
For few of them, I am happy to survive without advanced CSS which shall makes things effortless, and might reduce the mark-up by a few KBs while making it look much cleaner. BUT cry so badly on the time of testing CSS performance. Although these are so tempting that I will not hesitate trying each one of them on personal websites.