By randomly changing the opacity and adding a little text-shadow, one can create this old typewriter effect: Makes good use of currentColor for the shadow, so it can be applied on any coloured text. Old Typewriter Text Effect → 💁♂️ Don’t confuse this effect with a typing carousel which types the letters one-by-one.
I like this JS typewriter effect: The HTML that goes along with that is really simple: <h1>This pen is <span class="txt-rotate" data-period="2000" data-rotate='[ "nerdy.", "simple.", "pure JS.", "pretty.", "fun!" ]'></span> </h1> Simple Typing Carousel →